diff --git a/RhSolutions.AddIn/AddIn/ResetBarFunction.cs b/RhSolutions.AddIn/AddIn/ResetBarFunction.cs
index a1a34fa..32bddfa 100644
--- a/RhSolutions.AddIn/AddIn/ResetBarFunction.cs
+++ b/RhSolutions.AddIn/AddIn/ResetBarFunction.cs
@@ -1,9 +1,15 @@
-namespace RhSolutions.AddIn;
+#if !NET472
+using System.Runtime.Versioning;
+#endif
 
+namespace RhSolutions.AddIn;
+#if !NET472
+[SupportedOSPlatform("windows")]
+#endif
 public static class ResetBarFunction
 {
     [ExcelFunction]
-    public static void _ResetStatusBar()
+    public static void StatusBarReset()
     {
         RhSolutionsAddIn.Excel.StatusBar = false;
     }
diff --git a/RhSolutions.AddIn/AddIn/RhSolutionsAddIn.cs b/RhSolutions.AddIn/AddIn/RhSolutionsAddIn.cs
index 796e540..0ef2d69 100644
--- a/RhSolutions.AddIn/AddIn/RhSolutionsAddIn.cs
+++ b/RhSolutions.AddIn/AddIn/RhSolutionsAddIn.cs
@@ -1,8 +1,15 @@
 using ExcelDna.IntelliSense;
+using RhSolutions.Tools;
 using System.Net;
+#if !NET472
+using System.Runtime.Versioning;
+#endif
 
 namespace RhSolutions.AddIn;
 
+#if !NET472
+[SupportedOSPlatform("windows")]
+#endif
 public sealed class RhSolutionsAddIn : IExcelAddIn
 {
     public static Application Excel { get; private set; }
@@ -14,9 +21,12 @@ public sealed class RhSolutionsAddIn : IExcelAddIn
         IServiceCollection Services = new ServiceCollection();
 
         Services.AddHttpClient()
+            .AddSingleton((Application)ExcelDnaUtil.Application)
             .AddSingleton<IDatabaseClient, RhDatabaseClient>()
-            .AddSingleton<IAddInConfiguration, AddInConfiguration>()
-            .AddSingleton((Application)ExcelDnaUtil.Application);
+            .AddSingleton<IAddInConfiguration, RhAddInConfiguration>()
+            .AddTransient<IFileDialog, ExcelFileDialog>()
+            .AddTransient<IExcelReader, RhExcelReader>()
+            .AddTransient<IExcelWriter, RhExcelWriter>();
 
         ServiceProvider = Services.BuildServiceProvider();
         Configuration = ServiceProvider.GetService<IAddInConfiguration>();
diff --git a/RhSolutions.AddIn/AddIn/RhSolutionsFunction.cs b/RhSolutions.AddIn/AddIn/RhSolutionsFunction.cs
index bb7bba5..d45ed10 100644
--- a/RhSolutions.AddIn/AddIn/RhSolutionsFunction.cs
+++ b/RhSolutions.AddIn/AddIn/RhSolutionsFunction.cs
@@ -1,23 +1,29 @@
-namespace RhSolutions.AddIn;
+#if !NET472
+using System.Runtime.Versioning;
+#endif
 
+namespace RhSolutions.AddIn;
+
+#if !NET472
+[SupportedOSPlatform("windows")]
+#endif
 public class RhSolutionsFunction
 {
     [ExcelFunction(Description = "Распознать артикул и попробовать найти его в прайс-листе")]
     public static object RHSOLUTIONS([ExcelArgument(Name = "\"Строка с названием материала\"")] string line)
     {
         IDatabaseClient databaseClient = RhSolutionsAddIn.ServiceProvider.GetService<IDatabaseClient>();
-        IEnumerable<Product> requestResult = ExcelAsyncUtil.Run("Database request", line, delegate
+
+        Sku.TryParse(line, out var skus);
+
+        if (ExcelAsyncUtil.Run("Database request", line, delegate
         {
             return databaseClient.GetProducts(line)
                 .GetAwaiter()
                 .GetResult();
-        }) as IEnumerable<Product>;
-
-        Sku.TryParse(line, out var skus);
-
-        if (requestResult == null)
+        }) is not IEnumerable<Product> requestResult)
         {
-            if (skus.Count() > 0)
+            if (skus.Any())
             {
                 return $"{skus.First()} ...";
             }
@@ -29,12 +35,12 @@ public class RhSolutionsFunction
 
         else
         {
-            if (requestResult.Count() == 0 && skus.Count() == 0)
+            if (!requestResult.Any() && !skus.Any())
             {
                 return ExcelError.ExcelErrorNA;
             }
 
-            else if (requestResult.Count() == 0)
+            else if (!requestResult.Any())
             {
                 return $"{skus.First()}";
             }
diff --git a/RhSolutions.AddIn/Controllers/CombineTool.cs b/RhSolutions.AddIn/Controllers/CombineTool.cs
deleted file mode 100644
index 355539f..0000000
--- a/RhSolutions.AddIn/Controllers/CombineTool.cs
+++ /dev/null
@@ -1,59 +0,0 @@
-using RhSolutions.AddIn;
-
-namespace RhSolutions.Controllers;
-
-internal class CombineTool : ToolBase
-{
-    private List<SourcePriceList> SourceFiles { get; set; }
-
-    public CombineTool()
-    {
-        var dialog = RhSolutionsAddIn.Excel.FileDialog[Microsoft.Office.Core.MsoFileDialogType.msoFileDialogFilePicker];
-        dialog.AllowMultiSelect = true;
-        dialog.Filters.Add("Файлы Excel", "*.xls; *.xlsx; *.xlsm");
-
-        if (dialog.Show() < 0)
-        {
-            List<string> files = new();
-
-            foreach (string file in dialog.SelectedItems)
-            {
-                files.Add(file);
-            }
-
-            SourceFiles = SourcePriceList.GetSourceLists(files.ToArray());
-        }
-
-        else
-        {
-            throw new Exception("Не выбраны файлы");
-        }
-    }
-
-    public override void FillTarget()
-    {
-        using (ProgressBar = new ProgressBar("Заполняю строки...", SourceFiles.Sum(file => file.PositionAmount.Count)))
-        using (ResultBar = new ResultBar())
-        {
-            foreach (SourcePriceList source in SourceFiles)
-            {
-                TargetFile.Sheet.Columns[TargetFile.AmountCell.Column]
-                    .EntireColumn
-                    .Insert(XlInsertShiftDirection.xlShiftToRight, XlInsertFormatOrigin.xlFormatFromRightOrBelow);
-
-                Range newColumnHeader = TargetFile.Sheet.Cells[TargetFile.AmountCell.Row, TargetFile.AmountCell.Column - 1];
-                newColumnHeader.Value2 = $"{source.Name}";
-                newColumnHeader.WrapText = true;
-
-                foreach (var kvp in source.PositionAmount)
-                {
-                    FillPositionAmountToColumns(kvp, TargetFile.AmountCell.Column - 1, TargetFile.AmountCell.Column);
-                    ProgressBar.Update();
-                }
-            }
-
-            FilterByAmount();
-            ResultBar.Update();
-        }
-    }
-}
diff --git a/RhSolutions.AddIn/Controllers/ConvertTool.cs b/RhSolutions.AddIn/Controllers/ConvertTool.cs
deleted file mode 100644
index 754fde1..0000000
--- a/RhSolutions.AddIn/Controllers/ConvertTool.cs
+++ /dev/null
@@ -1,27 +0,0 @@
-namespace RhSolutions.Controllers;
-
-internal class ConvertTool : ToolBase
-{
-    private SourcePriceList Current { get; set; }
-
-    public ConvertTool()
-    {
-        Current = new SourcePriceList(ExcelApp.ActiveWorkbook);
-    }
-
-    public override void FillTarget()
-    {
-        using (ProgressBar = new ProgressBar("Заполняю строки...", Current.PositionAmount.Count))
-        using (ResultBar = new ResultBar())
-        {
-            foreach (var kvp in Current.PositionAmount)
-            {
-                FillPositionAmountToColumns(kvp, TargetFile.AmountCell.Column);
-                ProgressBar.Update();
-            }
-
-            FilterByAmount();
-            ResultBar.Update();
-        }
-    }
-}
\ No newline at end of file
diff --git a/RhSolutions.AddIn/Controllers/ExportTool.cs b/RhSolutions.AddIn/Controllers/ExportTool.cs
deleted file mode 100644
index 16b51aa..0000000
--- a/RhSolutions.AddIn/Controllers/ExportTool.cs
+++ /dev/null
@@ -1,97 +0,0 @@
-using RhSolutions.Models;
-using System.Collections.Generic;
-using System.Linq;
-
-namespace RhSolutions.Controllers;
-
-internal class ExportTool : ToolBase
-{
-    private Dictionary<Product, double> PositionAmount;
-    private readonly Range Selection;
-
-    public ExportTool()
-    {
-        Selection = ExcelApp.Selection;
-        GetSelected();
-
-        if (PositionAmount.Count == 0)
-        {
-            throw new Exception("В выделенном диапазоне не найдены позиции для экспорта");
-        }
-    }
-
-    public override void FillTarget()
-    {
-        using (ProgressBar = new ProgressBar("Заполняю строки...", PositionAmount.Count))
-        using (ResultBar = new ResultBar())
-        {
-            foreach (var kvp in PositionAmount)
-            {
-                FillPositionAmountToColumns(kvp, TargetFile.AmountCell.Column);
-                ProgressBar.Update();
-            }
-
-            FilterByAmount();
-            ResultBar.Update();
-        }
-    }
-
-    private void GetSelected()
-    {
-        object[,] cells = Selection.Value2;
-        PositionAmount = new Dictionary<Product, double>();
-
-        int rowsCount = Selection.Rows.Count;
-
-        for (int row = 1; row <= rowsCount; row++)
-        {
-            if (cells[row, 1] == null || cells[row, 2] == null)
-                continue;
-
-            string sku = null;
-            double? amount = null;
-
-            for (int column = 1; column <= 2; column++)
-            {
-                object current = cells[row, column];
-
-                if (Sku.TryParse(current.ToString(), out var rauSku))
-                {
-                    sku = rauSku.FirstOrDefault().ToString() ?? null;
-                }
-
-                else if (current.GetType() == typeof(string)
-                    && double.TryParse(current.ToString(), out _))
-                {
-                    amount = double.Parse((string)current);
-                }
-
-                else if (current.GetType() == typeof(double))
-                {
-                    amount = (double)current;
-                }
-            }
-
-            if (sku == null || amount == null)
-            {
-                continue;
-            }
-
-            Product position = new Product
-            {
-                ProductSku = sku
-            };
-
-            if (PositionAmount.ContainsKey(position))
-            {
-                PositionAmount[position] += amount.Value;
-            }
-
-            else
-            {
-                PositionAmount.Add(position, amount.Value);
-            }
-        }
-    }
-}
-
diff --git a/RhSolutions.AddIn/Controllers/MergeTool.cs b/RhSolutions.AddIn/Controllers/MergeTool.cs
deleted file mode 100644
index 8566ee7..0000000
--- a/RhSolutions.AddIn/Controllers/MergeTool.cs
+++ /dev/null
@@ -1,56 +0,0 @@
-using RhSolutions.AddIn;
-using RhSolutions.Models;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-
-namespace RhSolutions.Controllers
-{
-    internal class MergeTool : ToolBase
-    {
-        private List<SourcePriceList> SourceFiles { get; set; }
-
-        public MergeTool()
-        {
-            var dialog = RhSolutionsAddIn.Excel.FileDialog[Microsoft.Office.Core.MsoFileDialogType.msoFileDialogFilePicker];
-            dialog.AllowMultiSelect = true;
-            dialog.Filters.Add("Файлы Excel", "*.xls; *.xlsx; *.xlsm");
-
-            if ( dialog.Show() < 0)
-            {
-                List<string> files = new();
-
-                foreach (string file in dialog.SelectedItems)
-                {
-                    files.Add(file);
-                }
-
-                SourceFiles = SourcePriceList.GetSourceLists(files.ToArray());
-            } 
-
-            else
-            {
-                throw new Exception("Не выбраны файлы");
-            }
-        }
-
-        public override void FillTarget()
-        {
-            using (ProgressBar = new ProgressBar("Заполняю строки...", SourceFiles.Sum(x => x.PositionAmount.Count)))
-            using (ResultBar = new ResultBar())
-            {
-                foreach (SourcePriceList source in SourceFiles)
-                {
-                    foreach (var kvp in source.PositionAmount)
-                    {
-                        FillPositionAmountToColumns(kvp, TargetFile.AmountCell.Column);
-                        ProgressBar.Update();
-                    }
-                }
-
-                FilterByAmount();
-                ResultBar.Update();
-            }
-        }
-    }
-}
diff --git a/RhSolutions.AddIn/Controllers/RibbonController.cs b/RhSolutions.AddIn/Controllers/RibbonController.cs
index 978732d..880d49f 100644
--- a/RhSolutions.AddIn/Controllers/RibbonController.cs
+++ b/RhSolutions.AddIn/Controllers/RibbonController.cs
@@ -1,11 +1,17 @@
 using ExcelDna.Integration.CustomUI;
-using RhSolutions.AddIn;
+using RhSolutions.Tools;
 using System.Reflection;
 using System.Runtime.InteropServices;
+#if! NET472
+using System.Runtime.Versioning;
+#endif
 using System.Windows.Forms;
 
 namespace RhSolutions.Controllers;
 
+#if !NET472
+[SupportedOSPlatform("windows")]
+#endif
 [ComVisible(true)]
 public class RibbonController : ExcelRibbon
 {
@@ -21,10 +27,7 @@ public class RibbonController : ExcelRibbon
             <group id='priceList' label='Прайс-лист'>
                 <button id='export' getEnabled='GetExportEnabled' label='Экспорт в новый файл' size='normal' imageMso='PivotExportToExcel' onAction='OnToolPressed'/> 
                 <button id='convert' getEnabled='GetConvertEnabled' label='Актуализировать' size='normal' imageMso='FileUpdate' onAction='OnToolPressed'/> 
-                <menu id='conjoinMenu' label='Объединить' imageMso='Copy'>
-                    <button id='merge' label='Сложить' onAction='OnToolPressed'/>    
-                    <button id='combine' label='По колонкам' onAction='OnToolPressed'/>   
-                </menu>
+                <button id='merge' label='Объединить' size='normal' imageMso='Copy' onAction='OnToolPressed'/> 
             </group>
             <group id='rausettings' getLabel='GetVersionLabel'>
                 <button id='setPriceList' getLabel='GetPriceListPathLabel' size='large' imageMso='TableExcelSpreadsheetInsert' onAction='OnSetPricePressed'/>
@@ -42,22 +45,17 @@ public class RibbonController : ExcelRibbon
 
     public static void RefreshControl(string id)
     {
-        if (ribbonUi != null)
-        {
-            ribbonUi.InvalidateControl(id);
-        }
+        ribbonUi?.InvalidateControl(id);
     }
 
     public void OnSetPricePressed(IRibbonControl control)
     {
-        var dialog = RhSolutionsAddIn.Excel
-            .FileDialog[Microsoft.Office.Core.MsoFileDialogType.msoFileDialogFilePicker];
-        dialog.AllowMultiSelect = false;
-        dialog.Filters.Add("Файлы Excel", "*.xls; *.xlsx; *.xlsm");          
+        IFileDialog dialog = RhSolutionsAddIn.ServiceProvider.GetService<IFileDialog>();
+        string file = dialog.GetFile();
 
-        if (dialog.Show() < 0)
+        if (!string.IsNullOrEmpty(file))
         {
-            RhSolutionsAddIn.Configuration.SetPriceListPath(dialog.SelectedItems.Item(1));
+            RhSolutionsAddIn.Configuration.SetPriceListPath(file);
             RhSolutionsAddIn.Configuration.SaveSettings();
         }
     }
@@ -71,11 +69,9 @@ public class RibbonController : ExcelRibbon
                 "export" => new ExportTool(),
                 "convert" => new ConvertTool(),
                 "merge" => new MergeTool(),
-                "combine" => new CombineTool(),
                 _ => throw new Exception("Неизвестный инструмент"),
             };
-            tool.OpenNewPrice();
-            tool.FillTarget();
+            tool.Execute();
         }
 
         catch (Exception exception)
@@ -122,6 +118,6 @@ public class RibbonController : ExcelRibbon
     public string GetPriceListPathLabel(IRibbonControl control)
     {
         string name = RhSolutionsAddIn.Configuration.GetPriceListFileName();
-        return string.IsNullOrEmpty(name) ? "Нет файла шаблона!" : name;
+        return string.IsNullOrEmpty(name) ? "Шаблонный файл" : name;
     }
 }
diff --git a/RhSolutions.AddIn/Controllers/ToolBase.cs b/RhSolutions.AddIn/Controllers/ToolBase.cs
deleted file mode 100644
index 3f9d82d..0000000
--- a/RhSolutions.AddIn/Controllers/ToolBase.cs
+++ /dev/null
@@ -1,183 +0,0 @@
-using RhSolutions.AddIn;
-
-namespace RhSolutions.Controllers
-{
-    internal abstract class ToolBase
-    {
-        protected Application ExcelApp = RhSolutionsAddIn.Excel;
-        protected IAddInConfiguration Configuration = RhSolutionsAddIn.Configuration;
-        protected TargetPriceList TargetFile { get; set; }
-        protected ResultBar ResultBar { get; set; }
-        protected ProgressBar ProgressBar { get; set; }
-        public abstract void FillTarget();
-
-        public void OpenNewPrice()
-        {
-            if (ExcelApp.Workbooks
-                .Cast<Workbook>()
-                .FirstOrDefault(w => w.FullName == Configuration.GetPriceListPath()) != null)
-            {
-                throw new ArgumentException("Шаблонный файл редактируется в другом месте");
-            }
-
-            Workbook wb = ExcelApp.Workbooks.Open(Configuration.GetPriceListPath(), null, true);
-
-            try
-            {
-                TargetFile = new TargetPriceList(wb);
-            }
-
-            catch (Exception exception)
-            {
-                if (wb != null)
-                {
-                    wb.Close();
-                }
-
-                throw exception;
-            }
-        }
-
-        protected void FillPositionAmountToColumns(KeyValuePair<Product, double> positionAmount, params int[] columns)
-        {
-            Range worksheetCells = TargetFile.Sheet.Cells;
-            Range skuColumn = TargetFile.SkuCell.EntireColumn;
-
-            int? row = GetPositionRow(skuColumn, positionAmount.Key.ProductSku, positionAmount.Key.ProductLine);
-
-            if (row != null)
-            {
-                foreach (int column in columns)
-                {
-                    Range cell = worksheetCells[row, column];
-                    cell.AddValue(positionAmount.Value);
-                }
-
-                ResultBar.IncrementSuccess();
-                return;
-            }
-
-            if (TargetFile.OldSkuCell != null)
-            {
-                row = GetPositionRow(TargetFile.OldSkuCell.EntireColumn, positionAmount.Key.ProductSku, positionAmount.Key.ProductLine);
-
-                if (row != null)
-                {
-                    foreach (int column in columns)
-                    {
-                        Range cell = worksheetCells[row, column];
-                        cell.AddValue(positionAmount.Value);
-                    }
-
-                    ResultBar.IncrementReplaced();
-                    return;
-                }
-            }
-
-            string sku = positionAmount.Key.ProductSku.Substring(1, 6);
-            row = GetPositionRow(skuColumn, sku, positionAmount.Key.ProductLine);
-
-            if (row != null)
-            {
-                foreach (int column in columns)
-                {
-                    Range cell = worksheetCells[row, column];
-                    cell.AddValue(positionAmount.Value);
-                }
-
-                ResultBar.IncrementReplaced();
-                return;
-            }
-
-            FillMissing(positionAmount, columns);
-            ResultBar.IncrementNotFound();
-        }
-
-        protected void FillMissing(KeyValuePair<Product, double> positionAmount, params int[] columns)
-        {
-            Range worksheetCells = TargetFile.Sheet.Cells;
-            Range worksheetRows = TargetFile.Sheet.Rows;
-            int skuColumn = TargetFile.SkuCell.Column;
-            int groupColumn = TargetFile.GroupCell.Column;
-            int nameColumn = TargetFile.NameCell.Column;
-
-            int row = worksheetCells[worksheetRows.Count, skuColumn]
-                .End[XlDirection.xlUp]
-                .Row + 1;
-
-            worksheetRows[row]
-                .EntireRow
-                .Insert(XlInsertShiftDirection.xlShiftDown, XlInsertFormatOrigin.xlFormatFromLeftOrAbove);
-
-            Range previous = worksheetRows[row - 1];
-            Range current = worksheetRows[row];
-
-            previous.Copy(current);
-            current.ClearContents();
-
-            worksheetCells[row, groupColumn].Value2 = positionAmount.Key.ProductLine;
-            worksheetCells[row, nameColumn].Value2 = positionAmount.Key.Name;
-
-            if (TargetFile.OldSkuCell != null)
-            {
-                worksheetCells[row, skuColumn].Value2 = "Не найден";
-                worksheetCells[row, TargetFile.OldSkuCell.Column].Value2 = positionAmount.Key.ProductSku;
-            }
-
-            else
-            {
-                worksheetCells[row, skuColumn].Value2 = positionAmount.Key.ProductSku;
-            }
-
-            foreach (int column in columns)
-            {
-                Range cell = worksheetCells[row, column];
-                cell.AddValue(positionAmount.Value);
-            }
-        }
-
-        protected int? GetPositionRow(Range range, string sku, string group)
-        {
-            Range found = range.Find(sku);
-            string foundGroupValue;
-
-            if (found == null)
-            {
-                return null;
-            }
-
-            int firstFoundRow = found.Row;
-
-            if (string.IsNullOrEmpty(group))
-            {
-                return found.Row;
-            }
-
-            while (true)
-            {
-                foundGroupValue = TargetFile.Sheet.Cells[found.Row, TargetFile.GroupCell.Column].Value2.ToString();
-
-                if (group.Equals(foundGroupValue))
-                {
-                    return found.Row;
-                }
-
-                found = range.FindNext(found);
-
-                if (found.Row == firstFoundRow)
-                {
-                    return null;
-                }
-            }
-        }
-
-        protected void FilterByAmount()
-        {
-            AutoFilter filter = TargetFile.Sheet.AutoFilter;
-            int startColumn = filter.Range.Column;
-
-            filter.Range.AutoFilter(TargetFile.AmountCell.Column - startColumn + 1, "<>0", XlAutoFilterOperator.xlAnd, "<>");
-            TargetFile.Sheet.Range["A1"].Activate();
-        }
-    }
-}
\ No newline at end of file
diff --git a/RhSolutions.AddIn/Models/PriceListBase.cs b/RhSolutions.AddIn/Models/PriceListBase.cs
deleted file mode 100644
index 95f385d..0000000
--- a/RhSolutions.AddIn/Models/PriceListBase.cs
+++ /dev/null
@@ -1,15 +0,0 @@
-using Microsoft.Office.Interop.Excel;
-
-namespace RhSolutions.Models
-{
-    internal abstract class PriceListBase
-    {
-        public Range AmountCell { get; protected set; }
-        public Range SkuCell { get; protected set; }
-        public Range GroupCell { get; protected set; }
-        public Range NameCell { get; protected set; }
-
-        public Worksheet Sheet { get; protected set; }
-        public string Name { get; protected set; }
-    }
-}
\ No newline at end of file
diff --git a/RhSolutions.AddIn/Models/ProgressBar.cs b/RhSolutions.AddIn/Models/ProgressBar.cs
deleted file mode 100644
index 82012e5..0000000
--- a/RhSolutions.AddIn/Models/ProgressBar.cs
+++ /dev/null
@@ -1,22 +0,0 @@
-namespace RhSolutions.Models
-{
-    internal class ProgressBar : StatusbarBase
-    {
-        private double CurrentProgress { get; set; }
-        private readonly double TaskWeight;
-        private readonly string Message;
-
-        public ProgressBar(string message, int weight)
-        {
-            Message = message;
-            TaskWeight = weight;
-            CurrentProgress = 0;
-        }
-
-        public override void Update()
-        {
-            double percent = ++CurrentProgress / TaskWeight * 100;
-            Excel.StatusBar = $"{Message} Выполнено {percent:#.#} %";
-        }
-    }
-}
diff --git a/RhSolutions.AddIn/Models/ResultBar.cs b/RhSolutions.AddIn/Models/ResultBar.cs
deleted file mode 100644
index 655540c..0000000
--- a/RhSolutions.AddIn/Models/ResultBar.cs
+++ /dev/null
@@ -1,45 +0,0 @@
-using System;
-using System.Text;
-
-namespace RhSolutions.Models
-{
-    internal class ResultBar : StatusbarBase
-    {
-        private int Success { get; set; }
-        private int Replaced { get; set; }
-        private int NotFound { get; set; }
-
-        public ResultBar()
-        {
-            Success = 0;
-            Replaced = 0;
-            NotFound = 0;
-        }
-
-        public void IncrementSuccess() => Success++;
-        public void IncrementReplaced() => Replaced++;
-        public void IncrementNotFound() => NotFound++;
-
-        public override void Update()
-        {
-            StringBuilder sb = new StringBuilder();
-
-            if (Success > 0)
-            {
-                sb.Append($"Успешно экспортировано {Success} артикулов. ");
-            }
-
-            if (Replaced > 0)
-            {
-                sb.Append($"Заменено {Replaced} артикулов. ");
-            }
-
-            if (NotFound > 0)
-            {
-                sb.Append($"Не найдено {NotFound} артикулов.");
-            }
-
-            Excel.StatusBar = sb.ToString(); 
-        }
-    }
-}
diff --git a/RhSolutions.AddIn/Models/SourcePriceList.cs b/RhSolutions.AddIn/Models/SourcePriceList.cs
deleted file mode 100644
index db691ec..0000000
--- a/RhSolutions.AddIn/Models/SourcePriceList.cs
+++ /dev/null
@@ -1,112 +0,0 @@
-using RhSolutions.AddIn;
-using System.IO;
-
-namespace RhSolutions.Models;
-
-internal class SourcePriceList : PriceListBase
-{
-    public Dictionary<Product, double> PositionAmount { get; private set; }
-
-    public SourcePriceList(Workbook workbook)
-    {
-        if (workbook == null)
-        {
-            throw new ArgumentException($"Нет рабочего файла");
-        }
-
-        Sheet = workbook.ActiveSheet;
-        Name = Path.GetFileNameWithoutExtension(workbook.FullName);
-
-        var pricelistParameters = RhSolutionsAddIn.Configuration.GetPriceListParameters();
-
-        Range[] cells = new[]
-        {
-            AmountCell = Sheet.Cells.Find(pricelistParameters["Amount"]),
-            SkuCell = Sheet.Cells.Find(pricelistParameters["Sku"]),
-            GroupCell = Sheet.Cells.Find(pricelistParameters["Group"]),
-            NameCell = Sheet.Cells.Find(pricelistParameters["Name"])
-        };
-
-        if (cells.Any(x => x == null))
-        {
-            throw new ArgumentException($"Файл {Name} не распознан");
-        }
-
-        CreatePositionsDict();
-    }
-
-    public static List<SourcePriceList> GetSourceLists(string[] files)
-    {
-        var ExcelApp = (Application)ExcelDnaUtil.Application;
-        ProgressBar bar = new ProgressBar("Открываю исходные файлы...", files.Length);
-
-        List<SourcePriceList> sourceFiles = new List<SourcePriceList>();
-
-        foreach (string file in files)
-        {
-            ExcelApp.ScreenUpdating = false;
-            Workbook wb = ExcelApp.Workbooks.Open(file);
-            try
-            {
-                SourcePriceList priceList = new SourcePriceList(wb);
-                sourceFiles.Add(priceList);
-                wb.Close();
-                bar.Update();
-            }
-            catch (Exception ex)
-            {
-                System.Windows.Forms.MessageBox.Show
-                    (ex.Message,
-                    "Ошибка открытия исходного прайс-листа",
-                    System.Windows.Forms.MessageBoxButtons.OK,
-                    System.Windows.Forms.MessageBoxIcon.Information);
-                wb.Close();
-                bar.Update();
-            }
-            ExcelApp.ScreenUpdating = true;
-        }
-
-        return sourceFiles;
-    }
-
-    private void CreatePositionsDict()
-    {
-        PositionAmount = new Dictionary<Product, double>();
-
-        for (int row = AmountCell.Row + 1; row <= Sheet.Cells[Sheet.Rows.Count, AmountCell.Column].End[XlDirection.xlUp].Row; row++)
-        {
-            double? amount = Sheet.Cells[row, AmountCell.Column].Value2 as double?;
-
-            if (amount != null && amount.Value != 0)
-            {
-                object group = Sheet.Cells[row, GroupCell.Column].Value2;
-                object name = Sheet.Cells[row, NameCell.Column].Value2;
-                object sku = Sheet.Cells[row, SkuCell.Column].Value2;
-
-                if (group == null || name == null || sku == null)
-                    continue;
-
-                if (!Sku.TryParse(sku.ToString(), out _))
-                    continue;
-
-                Product p = new Product
-                {
-                    ProductSku = sku.ToString(),
-                    ProductLine = group.ToString(),
-                    Name = name.ToString()
-                };
-
-                if (PositionAmount.ContainsKey(p))
-                {
-                    PositionAmount[p] += amount.Value;
-                }
-
-                else
-                {
-                    PositionAmount.Add(p, amount.Value);
-                }
-            }
-        }
-    }
-}
-
diff --git a/RhSolutions.AddIn/Models/StatusbarBase.cs b/RhSolutions.AddIn/Models/StatusbarBase.cs
deleted file mode 100644
index fbec70e..0000000
--- a/RhSolutions.AddIn/Models/StatusbarBase.cs
+++ /dev/null
@@ -1,18 +0,0 @@
-using Microsoft.Office.Interop.Excel;
-using RhSolutions.AddIn;
-using System;
-
-namespace RhSolutions.Models
-{
-    internal abstract class StatusbarBase : IDisposable
-    {
-        protected Application Excel = RhSolutionsAddIn.Excel;
-
-        public abstract void Update();
-
-        public void Dispose()
-        {
-            Excel.OnTime(DateTime.Now + new TimeSpan(0, 0, 5), "_ResetStatusBar");
-        }
-    }
-}
diff --git a/RhSolutions.AddIn/Models/TargetPriceList.cs b/RhSolutions.AddIn/Models/TargetPriceList.cs
deleted file mode 100644
index 15ba066..0000000
--- a/RhSolutions.AddIn/Models/TargetPriceList.cs
+++ /dev/null
@@ -1,39 +0,0 @@
-using RhSolutions.AddIn;
-using System.IO;
-
-namespace RhSolutions.Models;
-
-internal class TargetPriceList : PriceListBase
-{
-    public Range OldSkuCell { get; private set; }
-
-    public TargetPriceList(Workbook workbook)
-    {
-        if (workbook == null)
-        {
-            throw new ArgumentException("Невозможно открыть книгу шаблонного файла. " +
-                "Возможно открыт файл с именем, совпадающим с именем шаблонного файла.");
-        }
-
-        Sheet = workbook.ActiveSheet;
-        Name = Path.GetFileNameWithoutExtension(workbook.FullName);
-
-        var pricelistParameters = RhSolutionsAddIn.Configuration.GetPriceListParameters();  
-
-        Range[] cells = new[]
-        {
-            AmountCell = Sheet.Cells.Find(pricelistParameters["Amount"]),
-            SkuCell = Sheet.Cells.Find(pricelistParameters["Sku"]),
-            GroupCell = Sheet.Cells.Find(pricelistParameters["Group"]),
-            NameCell = Sheet.Cells.Find(pricelistParameters["Name"])
-        };
-
-        OldSkuCell = Sheet.Cells.Find(pricelistParameters["OldSku"]);
-
-        if (cells.Any(x => x == null))
-        {
-            throw new ArgumentException($"Шаблон {Name} не является прайс-листом");
-        }
-    }
-}
-
diff --git a/RhSolutions.AddIn/RhSolutions.AddIn.csproj b/RhSolutions.AddIn/RhSolutions.AddIn.csproj
index 536248e..81fcb6a 100644
--- a/RhSolutions.AddIn/RhSolutions.AddIn.csproj
+++ b/RhSolutions.AddIn/RhSolutions.AddIn.csproj
@@ -36,7 +36,4 @@
 		<PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
 		<PackageReference Include="RhSolutions.Sku" Version="0.1.1" />
 	</ItemGroup>
-	<ItemGroup>
-	  <ProjectReference Include="..\RhSolutions.ExcelExtensions\RhSolutions.ExcelExtensions.csproj" />
-	</ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/RhSolutions.AddIn/Services/ExcelFileDialog.cs b/RhSolutions.AddIn/Services/ExcelFileDialog.cs
new file mode 100644
index 0000000..9e70d46
--- /dev/null
+++ b/RhSolutions.AddIn/Services/ExcelFileDialog.cs
@@ -0,0 +1,45 @@
+namespace RhSolutions.Services;
+
+public class ExcelFileDialog : IFileDialog
+{
+    private Application _application;
+
+    public ExcelFileDialog(Application application)
+    {
+        _application = application;
+    }
+
+    public string GetFile()
+    {
+        var dialog = _application.FileDialog[Microsoft.Office.Core.MsoFileDialogType.msoFileDialogFilePicker];
+        dialog.AllowMultiSelect = false;
+        dialog.Filters.Add("Файлы Excel", "*.xls; *.xlsx; *.xlsm");
+
+        if (dialog.Show() == -1)
+        {
+            return dialog.SelectedItems.Item(1);
+        }
+        else return string.Empty;
+    }
+
+    public string[] GetFiles()
+    {
+        var dialog = _application.FileDialog[Microsoft.Office.Core.MsoFileDialogType.msoFileDialogFilePicker];
+        dialog.AllowMultiSelect = true;
+        dialog.Filters.Add("Файлы Excel", "*.xls; *.xlsx; *.xlsm");
+
+        if (dialog.Show() == -1)
+        {
+            List<string> files = new();
+
+            foreach (string file in dialog.SelectedItems)
+            {
+                files.Add(file);
+            }
+
+            return files.ToArray();
+        }
+        
+        else return Array.Empty<string>();
+    }
+}
diff --git a/RhSolutions.AddIn/Services/IAddInConfiguration.cs b/RhSolutions.AddIn/Services/IAddInConfiguration.cs
index 3c09007..4eb79f1 100644
--- a/RhSolutions.AddIn/Services/IAddInConfiguration.cs
+++ b/RhSolutions.AddIn/Services/IAddInConfiguration.cs
@@ -6,7 +6,7 @@ public interface IAddInConfiguration
 {
     public string GetPriceListPath();
     public string GetPriceListFileName();
-    public Dictionary<string, string> GetPriceListParameters();
+    public Dictionary<string, string> GetPriceListHeaders();
     public event SettingChangingEventHandler OnSettingsChange;
     public void SetPriceListPath(string value);
     public void SaveSettings();
diff --git a/RhSolutions.AddIn/Services/IExcelReader.cs b/RhSolutions.AddIn/Services/IExcelReader.cs
new file mode 100644
index 0000000..a134e4c
--- /dev/null
+++ b/RhSolutions.AddIn/Services/IExcelReader.cs
@@ -0,0 +1,8 @@
+namespace RhSolutions.Services;
+
+public interface IExcelReader
+{
+    public Dictionary<Product, double> ReadProducts(Range range);
+    public List<(string, Dictionary<Product, double>)> ReadProducts(IEnumerable<Worksheet> worksheets);
+    public List<(string, Dictionary<Product, double>)> ReadProducts(string[] files);
+} 
diff --git a/RhSolutions.AddIn/Services/IExcelWriter.cs b/RhSolutions.AddIn/Services/IExcelWriter.cs
new file mode 100644
index 0000000..5d2ea29
--- /dev/null
+++ b/RhSolutions.AddIn/Services/IExcelWriter.cs
@@ -0,0 +1,7 @@
+namespace RhSolutions.Services;
+
+public interface IExcelWriter
+{
+    public void WriteProducts(IEnumerable<(string, Dictionary<Product, double>)> products);
+    public void WriteProducts(Dictionary<Product, double> products);
+}
diff --git a/RhSolutions.AddIn/Services/IFileDialog.cs b/RhSolutions.AddIn/Services/IFileDialog.cs
new file mode 100644
index 0000000..6c85522
--- /dev/null
+++ b/RhSolutions.AddIn/Services/IFileDialog.cs
@@ -0,0 +1,7 @@
+namespace RhSolutions.Services;
+
+public interface IFileDialog
+{
+    public string[] GetFiles();
+    public string GetFile();
+}
diff --git a/RhSolutions.AddIn/Services/AddInConfiguration.cs b/RhSolutions.AddIn/Services/RhAddInConfiguration.cs
similarity index 80%
rename from RhSolutions.AddIn/Services/AddInConfiguration.cs
rename to RhSolutions.AddIn/Services/RhAddInConfiguration.cs
index 970cf52..620f9b7 100644
--- a/RhSolutions.AddIn/Services/AddInConfiguration.cs
+++ b/RhSolutions.AddIn/Services/RhAddInConfiguration.cs
@@ -3,18 +3,18 @@ using System.IO;
 
 namespace RhSolutions.Services;
 
-public class AddInConfiguration : ApplicationSettingsBase, IAddInConfiguration
+public class RhAddInConfiguration : ApplicationSettingsBase, IAddInConfiguration
 {
-    private Dictionary<string, string> _priceListParameters;
+    private readonly Dictionary<string, string> _priceListHeaders;
 
-    public AddInConfiguration()
+    public RhAddInConfiguration()
     {
-        _priceListParameters = new Dictionary<string, string>()
+        _priceListHeaders = new Dictionary<string, string>()
         {
             ["Amount"] = AmountHeader,
             ["OldSku"] = OldSkuHeader,
             ["Sku"] = SkuHeader,
-            ["Group"] = GroupHeader,
+            ["ProductLine"] = ProductLineHeader,
             ["Name"] = NameHeader
         };
     }
@@ -52,11 +52,11 @@ public class AddInConfiguration : ApplicationSettingsBase, IAddInConfiguration
 
     [UserScopedSetting]
     [DefaultSettingValue("Программа")]
-    public string GroupHeader
+    public string ProductLineHeader
     {
         get
         {
-            return (string)this[nameof(GroupHeader)];
+            return (string)this[nameof(ProductLineHeader)];
         }
     }
 
@@ -99,5 +99,5 @@ public class AddInConfiguration : ApplicationSettingsBase, IAddInConfiguration
     public string GetPriceListPath() => PriceListPath;
     public void SetPriceListPath(string value) => PriceListPath = value;
     public void SaveSettings() => base.Save();
-    public Dictionary<string, string> GetPriceListParameters() => _priceListParameters;
+    public Dictionary<string, string> GetPriceListHeaders() => _priceListHeaders;
 }
diff --git a/RhSolutions.AddIn/Services/RhExcelReader.cs b/RhSolutions.AddIn/Services/RhExcelReader.cs
new file mode 100644
index 0000000..0749482
--- /dev/null
+++ b/RhSolutions.AddIn/Services/RhExcelReader.cs
@@ -0,0 +1,169 @@
+using System.IO;
+using RhSolutions.Tools;
+#if !NET472
+using System.Runtime.Versioning;
+using RhSolutions.Tools;
+#endif
+
+namespace RhSolutions.Services;
+
+#if !NET472
+[SupportedOSPlatform("windows")]
+#endif
+public class RhExcelReader : IExcelReader, IDisposable
+{
+    private ProgressBar _progressBar;
+    private readonly Dictionary<string, string> headers;
+    private readonly Application _application;
+
+    public RhExcelReader(Application application, IAddInConfiguration configuration)
+    {
+        _application = application;
+        headers = configuration.GetPriceListHeaders();
+    }
+
+    public Dictionary<Product, double> ReadProducts(Range range)
+    {
+        object[,] cells = range.Value2;
+        Dictionary<Product, double> readResult = new();
+
+        for (int row = 1; row <= range.Rows.Count; row++)
+        {
+            if (cells[row, 1] == null || cells[row, 2] == null)
+                continue;
+
+            string currentSku = null;
+            double? currentAmount = null;
+
+            for (int column = 1; column <= 2; column++)
+            {
+                object currentCell = cells[row, column];
+
+                if (Sku.TryParse(currentCell.ToString(), out var validSku))
+                {
+                    currentSku = validSku.FirstOrDefault().ToString() ?? null;
+                }
+
+                else if (currentCell.GetType() == typeof(string)
+                    && double.TryParse(currentCell.ToString(), out _))
+                {
+                    currentAmount = double.Parse((string)currentCell);
+                }
+
+                else if (currentCell.GetType() == typeof(double))
+                {
+                    currentAmount = (double)currentCell;
+                }
+            }
+
+            if (currentSku == null || currentAmount == null)
+            {
+                continue;
+            }
+
+            Product product = new() { ProductSku = currentSku };
+
+            if (readResult.ContainsKey(product))
+            {
+                readResult[product] += currentAmount.Value;
+            }
+
+            else
+            {
+                readResult.Add(product, currentAmount.Value);
+            }
+        }
+
+        return readResult;
+    }
+
+    public List<(string, Dictionary<Product, double>)>
+        ReadProducts(IEnumerable<Worksheet> worksheets)
+    {
+        List<(string, Dictionary<Product, double>)> result = new();
+        foreach (Worksheet worksheet in worksheets)
+        {
+            if (!worksheet.IsRehauSource())
+            {
+                continue;
+            }
+
+            string wbName = Path.GetFileNameWithoutExtension(
+                worksheet.Parent.Name);
+
+            Range AmountCell = worksheet.Cells.Find(headers["Amount"]),
+                SkuCell = worksheet.Cells.Find(headers["Sku"]),
+                ProductLineCelll = worksheet.Cells.Find(headers["ProductLine"]),
+                NameCell = worksheet.Cells.Find(headers["Name"]);
+            var lastRowIndex = worksheet.Cells[worksheet.Rows.Count, AmountCell.Column]
+                .End[XlDirection.xlUp].Row;
+
+            Dictionary<Product, double> readResult = new();            
+
+            for (int row = AmountCell.Row + 1; row <= lastRowIndex; row++)
+            {
+                double? amount = worksheet.Cells[row, AmountCell.Column].Value2 as double?;
+
+                if (amount != null && amount.Value != 0)
+                {
+                    object programLine = worksheet.Cells[row, ProductLineCelll.Column].Value2;
+                    object name = worksheet.Cells[row, NameCell.Column].Value2;
+                    object sku = worksheet.Cells[row, SkuCell.Column].Value2;
+
+                    if (programLine == null || name == null || sku == null)
+                        continue;
+
+                    if (!Sku.TryParse(sku.ToString(), out _))
+                        continue;
+
+                    Product p = new()
+                    {
+                        ProductSku = sku.ToString(),
+                        ProductLine = programLine.ToString(),
+                        Name = name.ToString()
+                    };
+
+                    if (readResult.ContainsKey(p))
+                    {
+                        readResult[p] += amount.Value;
+                    }
+
+                    else
+                    {
+                        readResult.Add(p, amount.Value);
+                    }
+                }
+
+            }
+
+            result.Add((wbName, readResult));
+        }
+        return result;
+    }
+
+    public List<(string, Dictionary<Product, double>)> ReadProducts(string[] files)
+    {
+        _progressBar = new("Открываю исходные файлы...", files.Length);
+        List<Worksheet> worksheets = new();
+
+        _application.ScreenUpdating = false;
+        foreach (string file in files)
+        {
+            Workbook wb = _application.Workbooks.Open(file);
+            worksheets.Add(wb.ActiveSheet);
+            _progressBar.Update();
+        }
+        _application.ScreenUpdating = true;
+        var result = ReadProducts(worksheets);
+        foreach (var ws in worksheets)
+        {
+            ws.Parent.Close();
+        }
+        return result;
+    }
+
+    public void Dispose()
+    {
+        _progressBar.Dispose();
+    }
+}
\ No newline at end of file
diff --git a/RhSolutions.AddIn/Services/RhExcelWriter.cs b/RhSolutions.AddIn/Services/RhExcelWriter.cs
new file mode 100644
index 0000000..6fd43fc
--- /dev/null
+++ b/RhSolutions.AddIn/Services/RhExcelWriter.cs
@@ -0,0 +1,256 @@
+#if !NET472
+using System.Runtime.Versioning;
+using RhSolutions.Tools;
+#endif
+
+using RhSolutions.Tools;
+
+namespace RhSolutions.Services;
+
+#if !NET472
+[SupportedOSPlatform("windows")]
+#endif
+public class RhExcelWriter : IExcelWriter, IDisposable
+{
+    private readonly Application _application;
+    private Worksheet _worksheet;
+    private readonly ResultBar _resultBar;
+    private readonly Dictionary<string, string> _headers;
+    private readonly string _pricelistPath;
+    private ProgressBar _progressBar;
+
+    private Range _amountCell,
+        _skuCell,
+        _programLineCell,
+        _nameCell,
+        _oldSkuCell;
+
+    public RhExcelWriter(Application application, IAddInConfiguration configuration)
+    {
+        _application = application;
+        _pricelistPath = configuration.GetPriceListPath();
+        _resultBar = new();
+        _headers = configuration.GetPriceListHeaders();
+    }
+
+    public void WriteProducts(Dictionary<Product, double> products)
+    {
+        WriteProducts(new[] { (string.Empty, products) });
+    }
+
+    public void WriteProducts(IEnumerable<(string, Dictionary<Product, double>)> products)
+    {
+        _worksheet = OpenNewPrice();
+
+        if (!_worksheet.IsRehauSource())
+        {
+            _application.ActiveWorkbook.Close();
+            throw new ArgumentException(
+                $"Целевой файл {_application.ActiveWorkbook.Name} не является прайс-листом.");
+        }
+
+        _amountCell = _worksheet.Cells.Find(_headers["Amount"]);
+        _skuCell = _worksheet.Cells.Find(_headers["Sku"]);
+        _programLineCell = _worksheet.Cells.Find(_headers["ProductLine"]);
+        _nameCell = _worksheet.Cells.Find(_headers["Name"]);
+        _oldSkuCell = _worksheet.Cells.Find(_headers["OldSku"]);
+
+        _progressBar = new("Заполняю строки...", products
+            .Select(p => p.Item2)
+            .Sum(set => set.Count));
+
+        if (products.Count() == 1)
+        {
+            foreach (var kvp in products.First().Item2)
+            {
+                FillPositionAmountToColumns(kvp, _amountCell.Column);
+                _progressBar.Update();
+            }
+            FilterByAmount();
+            _resultBar.Update();
+        }
+
+        else
+        {
+            foreach (var product in products)
+            {
+                _worksheet.Columns[_amountCell.Column]
+                    .EntireColumn
+                    .Insert(XlInsertShiftDirection.xlShiftToRight, XlInsertFormatOrigin.xlFormatFromRightOrBelow);
+
+                Range newColumnHeader = _worksheet.Cells[_amountCell.Row, _amountCell.Column - 1];
+                newColumnHeader.Value2 = $"{product.Item1}";
+                newColumnHeader.WrapText = true;
+
+                foreach (var kvp in product.Item2)
+                {
+                    FillPositionAmountToColumns(kvp, _amountCell.Column - 1, _amountCell.Column);
+                    _progressBar.Update();
+                }
+            }
+
+            FilterByAmount();
+            _resultBar.Update();
+        }
+    }
+
+    private Worksheet OpenNewPrice()
+    {
+        if (_application.Workbooks
+            .Cast<Workbook>()
+            .FirstOrDefault(w => w.FullName == _pricelistPath) != null)
+        {
+            throw new ArgumentException("Шаблонный файл редактируется в другом месте");
+        }
+
+        return _application.Workbooks.Open(_pricelistPath, null, true).ActiveSheet;
+    }
+
+    private void FillPositionAmountToColumns(KeyValuePair<Product, double> positionAmount, params int[] columns)
+    {
+        Range worksheetCells = _worksheet.Cells;
+        Range skuColumn = _skuCell.EntireColumn;
+
+        int? row = GetPositionRow(skuColumn, positionAmount.Key.ProductSku, positionAmount.Key.ProductLine);
+
+        if (row != null)
+        {
+            foreach (int column in columns)
+            {
+                Range cell = worksheetCells[row, column];
+                cell.AddValue(positionAmount.Value);
+            }
+
+            _resultBar.IncrementSuccess();
+            return;
+        }
+
+        if (_oldSkuCell != null)
+        {
+            row = GetPositionRow(_oldSkuCell.EntireColumn, positionAmount.Key.ProductSku, positionAmount.Key.ProductLine);
+
+            if (row != null)
+            {
+                foreach (int column in columns)
+                {
+                    Range cell = worksheetCells[row, column];
+                    cell.AddValue(positionAmount.Value);
+                }
+
+                _resultBar.IncrementReplaced();
+                return;
+            }
+        }
+
+        string sku = positionAmount.Key.ProductSku.Substring(1, 6);
+        row = GetPositionRow(skuColumn, sku, positionAmount.Key.ProductLine);
+
+        if (row != null)
+        {
+            foreach (int column in columns)
+            {
+                Range cell = worksheetCells[row, column];
+                cell.AddValue(positionAmount.Value);
+            }
+
+            _resultBar.IncrementReplaced();
+            return;
+        }
+
+        FillMissing(positionAmount, columns);
+        _resultBar.IncrementNotFound();
+    }
+
+    private void FillMissing(KeyValuePair<Product, double> positionAmount, params int[] columns)
+    {
+        Range worksheetCells = _worksheet.Cells;
+        Range worksheetRows = _worksheet.Rows;
+        int skuColumn = _skuCell.Column;
+        int groupColumn = _programLineCell.Column;
+        int nameColumn = _nameCell.Column;
+
+        int row = worksheetCells[worksheetRows.Count, skuColumn]
+            .End[XlDirection.xlUp]
+            .Row + 1;
+
+        worksheetRows[row]
+            .EntireRow
+            .Insert(XlInsertShiftDirection.xlShiftDown, XlInsertFormatOrigin.xlFormatFromLeftOrAbove);
+
+        Range previous = worksheetRows[row - 1];
+        Range current = worksheetRows[row];
+
+        previous.Copy(current);
+        current.ClearContents();
+
+        worksheetCells[row, groupColumn].Value2 = positionAmount.Key.ProductLine;
+        worksheetCells[row, nameColumn].Value2 = positionAmount.Key.Name;
+
+        if (_oldSkuCell != null)
+        {
+            worksheetCells[row, skuColumn].Value2 = "Не найден";
+            worksheetCells[row, _oldSkuCell.Column].Value2 = positionAmount.Key.ProductSku;
+        }
+
+        else
+        {
+            worksheetCells[row, skuColumn].Value2 = positionAmount.Key.ProductSku;
+        }
+
+        foreach (int column in columns)
+        {
+            Range cell = worksheetCells[row, column];
+            cell.AddValue(positionAmount.Value);
+        }
+    }
+
+    private int? GetPositionRow(Range range, string sku, string group)
+    {
+        Range found = range.Find(sku);
+        string foundGroupValue;
+
+        if (found == null)
+        {
+            return null;
+        }
+
+        int firstFoundRow = found.Row;
+
+        if (string.IsNullOrEmpty(group))
+        {
+            return found.Row;
+        }
+
+        while (true)
+        {
+            foundGroupValue = _worksheet.Cells[found.Row, _programLineCell.Column].Value2.ToString();
+
+            if (group.Equals(foundGroupValue))
+            {
+                return found.Row;
+            }
+
+            found = range.FindNext(found);
+
+            if (found.Row == firstFoundRow)
+            {
+                return null;
+            }
+        }
+    }
+
+    private void FilterByAmount()
+    {
+        AutoFilter filter = _worksheet.AutoFilter;
+        int startColumn = filter.Range.Column;
+
+        filter.Range.AutoFilter(_amountCell.Column - startColumn + 1, "<>0", XlAutoFilterOperator.xlAnd, "<>");
+        _worksheet.Range["A1"].Activate();
+    }
+
+    public void Dispose()
+    {
+        _progressBar.Dispose();
+        _resultBar.Dispose();
+    }
+}
diff --git a/RhSolutions.AddIn/Models/WorksheetExtensions.cs b/RhSolutions.AddIn/Services/WorksheetExtensions.cs
similarity index 77%
rename from RhSolutions.AddIn/Models/WorksheetExtensions.cs
rename to RhSolutions.AddIn/Services/WorksheetExtensions.cs
index da38203..409cd5f 100644
--- a/RhSolutions.AddIn/Models/WorksheetExtensions.cs
+++ b/RhSolutions.AddIn/Services/WorksheetExtensions.cs
@@ -1,23 +1,28 @@
-using RhSolutions.AddIn;
+#if !NET472
+using System.Runtime.Versioning;
+#endif
 
 namespace RhSolutions.Services;
 
+#if !NET472
+[SupportedOSPlatform("windows")]
+#endif
 public static class WorksheetExtensions
 {
     public static bool IsRehauSource(this Worksheet worksheet)
     {
         Range amountCell;
         Range skuCell;
-        Range groupCell;
+        Range programLineCell;
         Range nameCell;
 
-        var pricelistParameters = RhSolutionsAddIn.Configuration.GetPriceListParameters();  
+        var pricelistParameters = RhSolutionsAddIn.Configuration.GetPriceListHeaders();  
 
         Range[] cells = new[]
         {
             amountCell = worksheet.Cells.Find(pricelistParameters["Amount"]),
             skuCell = worksheet.Cells.Find(pricelistParameters["Sku"]),
-            groupCell = worksheet.Cells.Find(pricelistParameters["Group"]),
+            programLineCell = worksheet.Cells.Find(pricelistParameters["ProductLine"]),
             nameCell = worksheet.Cells.Find(pricelistParameters["Name"])
         };
 
diff --git a/RhSolutions.AddIn/Tools/ConvertTool.cs b/RhSolutions.AddIn/Tools/ConvertTool.cs
new file mode 100644
index 0000000..c9782a1
--- /dev/null
+++ b/RhSolutions.AddIn/Tools/ConvertTool.cs
@@ -0,0 +1,20 @@
+using RhSolutions.AddIn;
+#if !NET472
+using System.Runtime.Versioning;
+#endif
+
+namespace RhSolutions.Tools;
+
+#if !NET472
+[SupportedOSPlatform("windows")]
+#endif
+internal class ConvertTool : ToolBase
+{
+    public override void Execute()
+    {
+        Application app = RhSolutionsAddIn.Excel.Application;
+        Worksheet worksheet = app.ActiveWorkbook.ActiveSheet;
+        var products = _reader.ReadProducts(new[] { worksheet });
+        _writer.WriteProducts(products);
+    }
+}
\ No newline at end of file
diff --git a/RhSolutions.AddIn/Services/EventsUtil.cs b/RhSolutions.AddIn/Tools/EventsUtil.cs
similarity index 91%
rename from RhSolutions.AddIn/Services/EventsUtil.cs
rename to RhSolutions.AddIn/Tools/EventsUtil.cs
index bd7dd7b..4bd6b89 100644
--- a/RhSolutions.AddIn/Services/EventsUtil.cs
+++ b/RhSolutions.AddIn/Tools/EventsUtil.cs
@@ -2,9 +2,15 @@
 using RhSolutions.AddIn;
 using RhSolutions.Controllers;
 using System.Configuration;
+#if !NET472
+using System.Runtime.Versioning;
+#endif
 
-namespace RhSolutions.Services
+namespace RhSolutions.Tools
 {
+#if !NET472
+    [SupportedOSPlatform("windows")]
+#endif
     internal static class EventsUtil
     {
         public static void Initialize()
diff --git a/RhSolutions.AddIn/Tools/ExportTool.cs b/RhSolutions.AddIn/Tools/ExportTool.cs
new file mode 100644
index 0000000..c943cf1
--- /dev/null
+++ b/RhSolutions.AddIn/Tools/ExportTool.cs
@@ -0,0 +1,20 @@
+using RhSolutions.AddIn;
+#if !NET472
+using System.Runtime.Versioning;
+#endif
+
+namespace RhSolutions.Tools;
+
+#if !NET472
+[SupportedOSPlatform("windows")]
+#endif
+internal class ExportTool : ToolBase
+{
+    public override void Execute()
+    {
+        Application app = RhSolutionsAddIn.Excel.Application;
+        var products = _reader.ReadProducts(app.Selection);
+        _writer.WriteProducts(products);
+    }
+}
+
diff --git a/RhSolutions.AddIn/Tools/MergeTool.cs b/RhSolutions.AddIn/Tools/MergeTool.cs
new file mode 100644
index 0000000..03cf104
--- /dev/null
+++ b/RhSolutions.AddIn/Tools/MergeTool.cs
@@ -0,0 +1,23 @@
+#if !NET472
+using System.Runtime.Versioning;
+using RhSolutions;
+using RhSolutions.Models;
+using RhSolutions.Tools;
+#endif
+
+
+namespace RhSolutions.Tools;
+
+#if !NET472
+[SupportedOSPlatform("windows")]
+#endif
+internal class MergeTool : ToolBase
+{
+    public override void Execute()
+    {
+        IFileDialog dialog = RhSolutionsAddIn.ServiceProvider.GetRequiredService<IFileDialog>();
+        string[] files = dialog.GetFiles();
+        var products = _reader.ReadProducts(files);
+        _writer.WriteProducts(products);
+    }
+}
diff --git a/RhSolutions.AddIn/Tools/ProgressBar.cs b/RhSolutions.AddIn/Tools/ProgressBar.cs
new file mode 100644
index 0000000..709f28c
--- /dev/null
+++ b/RhSolutions.AddIn/Tools/ProgressBar.cs
@@ -0,0 +1,28 @@
+#if !NET472
+using System.Runtime.Versioning;
+#endif
+
+namespace RhSolutions.Tools;
+
+#if !NET472
+[SupportedOSPlatform("windows")]
+#endif
+internal class ProgressBar : StatusbarBase
+{
+    private double CurrentProgress { get; set; }
+    private readonly double TaskWeight;
+    private readonly string Message;
+
+    public ProgressBar(string message, int weight)
+    {
+        Message = message;
+        TaskWeight = weight;
+        CurrentProgress = 0;
+    }
+
+    public override void Update()
+    {
+        double percent = ++CurrentProgress / TaskWeight * 100;
+        Excel.StatusBar = $"{Message} Выполнено {percent:#.#} %";
+    }
+}
diff --git a/RhSolutions.AddIn/Tools/ResultBar.cs b/RhSolutions.AddIn/Tools/ResultBar.cs
new file mode 100644
index 0000000..b14f307
--- /dev/null
+++ b/RhSolutions.AddIn/Tools/ResultBar.cs
@@ -0,0 +1,49 @@
+using System.Text;
+#if !NET472
+using System.Runtime.Versioning;
+#endif
+
+namespace RhSolutions.Tools;
+
+#if !NET472
+[SupportedOSPlatform("windows")]
+#endif
+internal class ResultBar : StatusbarBase
+{
+    private int Success { get; set; }
+    private int Replaced { get; set; }
+    private int NotFound { get; set; }
+
+    public ResultBar()
+    {
+        Success = 0;
+        Replaced = 0;
+        NotFound = 0;
+    }
+
+    public void IncrementSuccess() => Success++;
+    public void IncrementReplaced() => Replaced++;
+    public void IncrementNotFound() => NotFound++;
+
+    public override void Update()
+    {
+        StringBuilder sb = new StringBuilder();
+
+        if (Success > 0)
+        {
+            sb.Append($"Успешно экспортировано {Success} артикулов. ");
+        }
+
+        if (Replaced > 0)
+        {
+            sb.Append($"Заменено {Replaced} артикулов. ");
+        }
+
+        if (NotFound > 0)
+        {
+            sb.Append($"Не найдено {NotFound} артикулов.");
+        }
+
+        Excel.StatusBar = sb.ToString();
+    }
+}
diff --git a/RhSolutions.AddIn/Tools/StatusbarBase.cs b/RhSolutions.AddIn/Tools/StatusbarBase.cs
new file mode 100644
index 0000000..fe30eaa
--- /dev/null
+++ b/RhSolutions.AddIn/Tools/StatusbarBase.cs
@@ -0,0 +1,24 @@
+#if !NET472
+using System.Runtime.Versioning;
+using RhSolutions;
+using RhSolutions.Models;
+using RhSolutions.Tools;
+#endif
+
+
+namespace RhSolutions.Tools;
+
+#if !NET472
+[SupportedOSPlatform("windows")]
+#endif
+internal abstract class StatusbarBase : IDisposable
+{
+    protected Application Excel = RhSolutionsAddIn.Excel;
+
+    public abstract void Update();
+
+    public void Dispose()
+    {
+        Excel.OnTime(DateTime.Now + new TimeSpan(0, 0, 5), "StatusBarReset");
+    }
+}
diff --git a/RhSolutions.AddIn/Tools/ToolBase.cs b/RhSolutions.AddIn/Tools/ToolBase.cs
new file mode 100644
index 0000000..9c37bc3
--- /dev/null
+++ b/RhSolutions.AddIn/Tools/ToolBase.cs
@@ -0,0 +1,22 @@
+#if !NET472
+using System.Runtime.Versioning;
+#endif
+
+namespace RhSolutions.Tools;
+
+#if !NET472
+[SupportedOSPlatform("windows")]
+#endif
+internal abstract class ToolBase
+{
+    protected readonly IExcelReader _reader;
+    protected readonly IExcelWriter _writer;
+
+    public ToolBase()
+    {
+        _reader = RhSolutionsAddIn.ServiceProvider.GetRequiredService<IExcelReader>();
+        _writer = RhSolutionsAddIn.ServiceProvider.GetRequiredService<IExcelWriter>();
+    }
+
+    public abstract void Execute();
+}
\ No newline at end of file
diff --git a/RhSolutions.AddIn/Usings.cs b/RhSolutions.AddIn/Usings.cs
index 929f09f..0196089 100644
--- a/RhSolutions.AddIn/Usings.cs
+++ b/RhSolutions.AddIn/Usings.cs
@@ -1,9 +1,11 @@
 global using ExcelDna.Integration;
 global using Microsoft.Extensions.DependencyInjection;
 global using Microsoft.Office.Interop.Excel;
+global using RhSolutions.AddIn;
 global using RhSolutions.Models;
 global using RhSolutions.Services;
+global using RhSolutions.Tools;
 global using System;
 global using System.Collections.Generic;
 global using System.Linq;
-global using Range = Microsoft.Office.Interop.Excel.Range;
\ No newline at end of file
+global using Range = Microsoft.Office.Interop.Excel.Range;
diff --git a/RhSolutions.ExcelExtensions/Cell.cs b/RhSolutions.ExcelExtensions/Cell.cs
new file mode 100644
index 0000000..19a2017
--- /dev/null
+++ b/RhSolutions.ExcelExtensions/Cell.cs
@@ -0,0 +1,26 @@
+namespace RhSolutions.ExcelExtensions;
+
+public sealed class Cell
+{
+    public Table ParentTable { get; }
+    public Row ParentRow
+    {
+        get => ParentTable.Rows[ParentTable.Range.Row - _range.Row];
+    }
+    public Column ParentColumn
+    {
+        get => ParentTable.Columns[ParentTable.Range.Column - _range.Column];
+    }
+    public object Value
+    {
+        get => _range.Cells[1, 1].Value2;
+        set => _range.Cells[1, 1].Value2 = value;
+    }
+    private Range _range;
+
+    public Cell(Range range, Table table)
+    {
+        _range = range;
+        ParentTable = table;
+    }
+}
diff --git a/RhSolutions.ExcelExtensions/Column.cs b/RhSolutions.ExcelExtensions/Column.cs
index 53a1f3d..341897c 100644
--- a/RhSolutions.ExcelExtensions/Column.cs
+++ b/RhSolutions.ExcelExtensions/Column.cs
@@ -1,44 +1,62 @@
-using System.Collections;
+namespace RhSolutions.ExcelExtensions;
 
-namespace RhSolutions.ExcelExtensions;
-
-public sealed class Column : Table, IEnumerable<TableCell>
+public sealed class Column
 {
+    public Table ParentTable { get; }
     public string Header
     {
-        get => Range.Cells[1, 1].Value.ToString();
+        get => _range.Cells[1, 1].Value2.ToString() ?? String.Empty;
     }
     public int Index
     {
-        get => Range.Column - ParentTable.Range.Column;
+        get => _range.Column - ParentTable.Range.Column;
     }
     public int Length
     {
-        get => Range.Rows.Count;
+        get => _range.Rows.Count;
     }
+    private Cell[] _cells;
+    private readonly Range _range;
 
-    public Column(Range range, Table table) : base(range, table)
+    public Column(Range range, Table table)
     {
-        Range = range;
-        ParentTable = table;
+        _cells = new Cell[range.Rows.Count];
+        _range = range;
+        ParentTable = table ??
+            throw new ArgumentNullException("table"); 
     }
 
-    public TableCell this[int index]
+    public Cell this[int index]
     {
-        get => new(Range.Cells[index + 1, 1], ParentTable);
+        get
+        {
+            if (_cells[index] == null)
+            {
+                _cells[index] = new Cell(_range.Cells[index + 1, 1], ParentTable);
+                return _cells[index];
+            }
+            else
+            {
+                return _cells[index];
+            }
+        }
+        set
+        {
+            if (_cells[index] == null)
+            {
+                _cells[index] = new Cell(_range.Cells[index + 1, 1], ParentTable);
+                _cells[index].Value = value;
+            }
+            else
+            {
+                _cells[index].Value = value;
+            }
+        }
     }
 
-    public IEnumerator<TableCell> GetEnumerator()
-    {
-        return new ColumnEnumerator(Range, ParentTable);
-    }
-
-    IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
-
-
     public Column AddLeft()
     {
-        Range.EntireColumn
+        _range.EntireColumn
             .Insert(XlInsertShiftDirection.xlShiftToRight,
                 XlInsertFormatOrigin.xlFormatFromRightOrBelow);
 
diff --git a/RhSolutions.ExcelExtensions/ColumnEnumerator.cs b/RhSolutions.ExcelExtensions/ColumnEnumerator.cs
deleted file mode 100644
index 9880b5d..0000000
--- a/RhSolutions.ExcelExtensions/ColumnEnumerator.cs
+++ /dev/null
@@ -1,54 +0,0 @@
-using System.Collections;
-
-namespace RhSolutions.ExcelExtensions;
-
-public class ColumnEnumerator : IEnumerator<TableCell>
-{
-    public Range Range { get; }
-    public Table ParentTable { get; }
-    private int position = 0;
-    object IEnumerator.Current
-    {
-        get
-        {
-            return Current;
-        }
-    }
-
-    public TableCell Current
-    {
-        get
-        {
-            try
-            {
-                return new TableCell(Range.Cells[position, 1], ParentTable);
-            }
-            catch (IndexOutOfRangeException)
-            {
-                throw new InvalidOperationException();
-            }
-        }
-    }
-
-    public ColumnEnumerator(Range range, Table table)
-    {
-        Range = range;
-        ParentTable = table;
-    }
-
-    public bool MoveNext()
-    {
-        position++;
-        return (position <= Range.Rows.Count);
-    }
-
-    public void Reset()
-    {
-        position = 0;
-    }
-
-    public void Dispose()
-    {
-
-    }
-}
diff --git a/RhSolutions.ExcelExtensions/Columns.cs b/RhSolutions.ExcelExtensions/Columns.cs
index 1fbc0ef..014b755 100644
--- a/RhSolutions.ExcelExtensions/Columns.cs
+++ b/RhSolutions.ExcelExtensions/Columns.cs
@@ -4,35 +4,45 @@ namespace RhSolutions.ExcelExtensions;
 
 public class Columns : IEnumerable<Column>
 {
-    public Range Range { get; }
     public Table ParentTable { get; }
     public int Length
     {
-        get => Range.Columns.Count;
+        get => _range.Columns.Count;
     }
+    private Column[] _columns;
+    private Range _range;
 
-    public Columns(Range range, Table parentTable)
+    public Columns(Table parentTable)
     {
-        Range = range;
         ParentTable = parentTable;
+        _range = parentTable.Range;
+        _columns = new Column[Length];
     }
 
     public Column this[int index]
     {
         get
         {
-            if (index < 0 || index + 1 > Range.Columns.Count)
+            if (index < 0 || index >= Length)
             {
                 throw new IndexOutOfRangeException();
             }
 
-            return new Column(Range.Columns[index + 1], ParentTable);
+            if (_columns[index] == null)
+            {
+                _columns[index] = new Column(_range.Columns[index + 1], ParentTable);
+                return _columns[index];
+            }
+            else
+            {
+                return _columns[index];
+            }
         }
     }
 
     public IEnumerator<Column> GetEnumerator()
     {
-        return new ColumnsEnumerator(Range, ParentTable);
+        return new ColumnsEnumerator(this);
     }
 
     IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
diff --git a/RhSolutions.ExcelExtensions/ColumnsEnumerator.cs b/RhSolutions.ExcelExtensions/ColumnsEnumerator.cs
index 578e2b0..40ad4d6 100644
--- a/RhSolutions.ExcelExtensions/ColumnsEnumerator.cs
+++ b/RhSolutions.ExcelExtensions/ColumnsEnumerator.cs
@@ -4,9 +4,8 @@ namespace RhSolutions.ExcelExtensions;
 
 public class ColumnsEnumerator: IEnumerator<Column>
 {
-    public Range Range { get; }
-    public Table ParentTable { get; }
-    private int position = 0;
+    private Columns _columns;
+    private int position = -1;
     object IEnumerator.Current
     {
         get
@@ -21,7 +20,7 @@ public class ColumnsEnumerator: IEnumerator<Column>
         {
             try
             {
-                return new Column(Range.Columns[position], ParentTable);
+                return _columns[position];
             }
             catch (IndexOutOfRangeException)
             {
@@ -30,21 +29,20 @@ public class ColumnsEnumerator: IEnumerator<Column>
         }
     }
 
-    public ColumnsEnumerator(Range range, Table table)
+    public ColumnsEnumerator(Columns columns)
     {
-        Range = range;
-        ParentTable = table;
+        _columns = columns;
     }
 
     public bool MoveNext()
     {
         position++;
-        return (position <= Range.Columns.Count);
+        return (position < _columns.Length);
     }
 
     public void Reset()
     {
-        position = 0;
+        position = -1;
     }
 
     public void Dispose()
diff --git a/RhSolutions.ExcelExtensions/Row.cs b/RhSolutions.ExcelExtensions/Row.cs
index 32617b4..01df2e4 100644
--- a/RhSolutions.ExcelExtensions/Row.cs
+++ b/RhSolutions.ExcelExtensions/Row.cs
@@ -1,33 +1,54 @@
-using System.Collections;
+namespace RhSolutions.ExcelExtensions;
 
-namespace RhSolutions.ExcelExtensions;
-
-public sealed class Row : Table, IEnumerable<TableCell>
+public sealed class Row
 {
+    public Table ParentTable { get; }
     public int Index
     {
-        get => Range.Row - ParentTable.Range.Row;
+        get => _range.Row - ParentTable.Range.Row;
     }
     public int Length
     {
-        get => Range.Columns.Count;
+        get => _range.Columns.Count;
     }
+    private readonly Cell[] _cells;
+    private readonly Range _range;
 
-    public Row(Range range, Table table) : base(range, table)
+    public Row(Range range, Table table) 
     {
-        Range = range;
-        ParentTable = table;
+        _cells = new Cell[range.Columns.Count];
+        _range = range;
+        ParentTable = table ??
+            throw new ArgumentNullException("table");
     }
 
-    public TableCell this[int index]
+    public Cell this[int index]
     {
-        get => new(Range.Cells[1, index + 1], ParentTable);
+        get 
+        {
+            if (index < 0 || index >= Length)
+            {
+                throw new IndexOutOfRangeException();
+            }
+
+            if (_cells[index] == null)
+            {
+                _cells[index] = new Cell(_range.Cells[1, index + 1], ParentTable);
+                return _cells[index];
+            }
+            else
+            {
+                return _cells[index];
+            }
+        }
     }
 
-    public IEnumerator<TableCell> GetEnumerator()
+    public Cell this[string header]
     {
-        return new RowEnumerator(Range, ParentTable);
+        get
+        {
+            int columnIndex = ParentTable.ColumnByHeader(header).Index;
+            return this[columnIndex];
+        }
     }
-
-    IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
 }
diff --git a/RhSolutions.ExcelExtensions/RowEnumerator.cs b/RhSolutions.ExcelExtensions/RowEnumerator.cs
deleted file mode 100644
index fd56dcd..0000000
--- a/RhSolutions.ExcelExtensions/RowEnumerator.cs
+++ /dev/null
@@ -1,54 +0,0 @@
-using System.Collections;
-
-namespace RhSolutions.ExcelExtensions;
-
-public class RowEnumerator : IEnumerator<TableCell>
-{
-    public Range Range { get; }
-    public Table ParentTable { get; }
-    private int position = 0;
-    object IEnumerator.Current
-    {
-        get
-        {
-            return Current;
-        }
-    }
-
-    public TableCell Current
-    {
-        get
-        {
-            try
-            {
-                return new TableCell(Range.Cells[1, position], ParentTable);
-            }
-            catch (IndexOutOfRangeException)
-            {
-                throw new InvalidOperationException();
-            }
-        }
-    }
-
-    public RowEnumerator(Range range, Table parentTable)
-    {
-        Range = range;
-        ParentTable = parentTable;
-    }
-
-    public bool MoveNext()
-    {
-        position++;
-        return (position <= Range.Columns.Count);
-    }
-
-    public void Reset()
-    {
-        position = 0;
-    }
-
-    public void Dispose()
-    {
-
-    }
-}
\ No newline at end of file
diff --git a/RhSolutions.ExcelExtensions/Rows.cs b/RhSolutions.ExcelExtensions/Rows.cs
index 1c0bc0d..c6d4c01 100644
--- a/RhSolutions.ExcelExtensions/Rows.cs
+++ b/RhSolutions.ExcelExtensions/Rows.cs
@@ -4,35 +4,40 @@ namespace RhSolutions.ExcelExtensions;
 
 public class Rows : IEnumerable<Row>
 {
-    public Range Range { get; }
     public Table ParentTable { get; }
     public int Length
     {
-        get => Range.Rows.Count;
+        get => _range.Rows.Count;
     }
+    private Row[] _rows;
+    private Range _range;
 
-    public Rows(Range range, Table parentTable)
+    public Rows(Table parentTable)
     {
-        Range = range;
         ParentTable = parentTable;
+        _range = parentTable.Range;
+        _rows = new Row[Length];
     }
 
     public Row this[int index]
     {
         get
         {
-            if (index < 0 || index + 1 > Range.Rows.Count)
+            if (_rows[index] == null)
             {
-                throw new IndexOutOfRangeException();
+                _rows[index] = new Row(_range.Rows[index + 1], ParentTable);
+                return _rows[index];
+            }
+            else
+            {
+                return _rows[index];
             }
-
-            return new Row(Range.Rows[index + 1], ParentTable);
         }
     }
 
     public IEnumerator<Row> GetEnumerator()
     {
-        return new RowsEnumerator(Range, ParentTable);
+        return new RowsEnumerator(this);
     }
 
     IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
diff --git a/RhSolutions.ExcelExtensions/RowsEnumerator.cs b/RhSolutions.ExcelExtensions/RowsEnumerator.cs
index b53db98..4d68a9c 100644
--- a/RhSolutions.ExcelExtensions/RowsEnumerator.cs
+++ b/RhSolutions.ExcelExtensions/RowsEnumerator.cs
@@ -4,9 +4,8 @@ namespace RhSolutions.ExcelExtensions;
 
 public class RowsEnumerator : IEnumerator<Row>
 {
-    public Range Range { get; }
-    public Table ParentTable { get; }
-    private int position = 0;
+    private Rows _rows;
+    private int position = -1;
     object IEnumerator.Current
     {
         get
@@ -21,7 +20,7 @@ public class RowsEnumerator : IEnumerator<Row>
         {
             try
             {
-                return new Row(Range.Rows[position], ParentTable);
+                return _rows[position];
             }
             catch (IndexOutOfRangeException)
             {
@@ -30,26 +29,24 @@ public class RowsEnumerator : IEnumerator<Row>
         }
     }
 
-    public RowsEnumerator(Range range, Table table)
+    public RowsEnumerator(Rows rows)
     {
-        Range = range;
-        ParentTable = table;
+        _rows = rows;
     }
 
     public bool MoveNext()
     {
         position++;
-        return (position <= Range.Rows.Count);
+        return (position < _rows.Length);
     }
 
     public void Reset()
     {
-        position = 0;
+        position = -1;
     }
 
     public void Dispose()
     {
 
     }
-
 }
\ No newline at end of file
diff --git a/RhSolutions.ExcelExtensions/Table.cs b/RhSolutions.ExcelExtensions/Table.cs
index a19a4b4..aad2151 100644
--- a/RhSolutions.ExcelExtensions/Table.cs
+++ b/RhSolutions.ExcelExtensions/Table.cs
@@ -6,29 +6,40 @@ public class Table
     public Table ParentTable { get; protected set; }
     public Rows Rows { get; }
     public Columns Columns { get; }
+    private Dictionary<string, Column> _columnsByHeader;
 
     public Table(Range range)
     {
         Range = range;
-        ParentTable = null;
-        Rows = new Rows(Range, this);
-        Columns = new Columns(Range, this);
+        ParentTable = this;
+        Rows = new Rows(this);
+        Columns = new Columns(this);
+        _columnsByHeader = new();
+
+        foreach(var column in Columns)
+        {
+            if (_columnsByHeader.ContainsKey(column.Header))
+            {
+                throw new ArgumentException($"Заголовок столбца {column.Header} не уникален");
+            }
+            else
+            {
+                _columnsByHeader.Add(column.Header, column);
+            }
+        }
     }
 
-    public Table(Range range, Table table)
+    public Column ColumnByHeader(string header)
     {
-        Range = range;
-        ParentTable = table;
-        Rows = new Rows(Range, this);
-        Columns = new Columns(Range, this);
+        return _columnsByHeader[header];
     }
 
-    public TableCell this[int row, int column]
+    public Cell this[int row, int column]
     {
-        get => new(Range.Cells[row + 1, column + 1], this);
+        get => this.Rows[row][column];
     }
 
-    public IEnumerable<TableCell> Find(object item)
+    public IEnumerable<Cell> Search(object item)
     {
         Range firstFound = Range.Find(item);
         if (firstFound == null)
@@ -40,7 +51,7 @@ public class Table
 
         while (true)
         {
-            yield return new TableCell(nextFound, ParentTable ?? this);
+            yield return this[nextFound.Row - ParentTable.Range.Row, nextFound.Column - ParentTable.Range.Column];
             nextFound = Range.FindNext(nextFound);
 
             if (nextFound.Row == firstFound.Row
diff --git a/RhSolutions.ExcelExtensions/TableCell.cs b/RhSolutions.ExcelExtensions/TableCell.cs
deleted file mode 100644
index 822673e..0000000
--- a/RhSolutions.ExcelExtensions/TableCell.cs
+++ /dev/null
@@ -1,24 +0,0 @@
-namespace RhSolutions.ExcelExtensions;
-
-public sealed class TableCell : Table
-{
-    public Row ParentRow
-    {
-        get => ParentTable.Rows[ParentTable.Range.Row - Range.Row];
-    }
-    public Column ParentColumn
-    {
-        get => ParentTable.Columns[ParentTable.Range.Column - Range.Column];
-    }
-    public object Value
-    {
-        get => Range.Cells[1, 1].Value2;
-        set => Range.Cells[1, 1].Value2 = value;
-    }
-
-    public TableCell(Range range, Table table) : base(range, table)
-    {
-        Range = range;
-        ParentTable = table;
-    }
-}
diff --git a/RhSolutions.Tests/ExcelTablesTests.cs b/RhSolutions.Tests/ExcelTablesTests.cs
deleted file mode 100644
index 78264ac..0000000
--- a/RhSolutions.Tests/ExcelTablesTests.cs
+++ /dev/null
@@ -1,65 +0,0 @@
-namespace RhSolutions.Tests;
-
-[ExcelTestSettings(OutOfProcess = true, Workbook = @"TestWorkbooks\ExcelTableTest.xlsx")]
-public class ExcelTablesTests : IDisposable
-{
-    ExcelExtensions.Table table;
-
-    public ExcelTablesTests()
-    {
-        Util.Application.Workbooks.Add();
-
-        Worksheet worksheet = Util.Workbook.Sheets[1];
-        Range range = worksheet.Range["E7:G9"];
-        table = new(range);
-    }
-
-    [ExcelFact]
-    public void CanReadExcelTable()
-    {
-        Assert.Equal(3, table.Columns.Where(c => c.Header.StartsWith("Столбец")).Count());
-        Assert.Equal("Столбец 1", table.Rows.First()[0].Value);
-        Assert.Equal("Столбец 2", table[0, 1].Value);
-        Assert.Equal(123d, table[1, 1].Value);
-        Assert.Null(table[1, 2].Value);
-    }
-
-    [ExcelFact]
-    public void CanModifyTableCells()
-    {
-        table[2, 1].Value = 1;
-        table[1, 1].Value = (double)table[1, 1].Value + 123;
-        Assert.Equal(1d, table[2, 1].Value);
-        Assert.Equal(246d, table[1, 1].Value);
-    }
-
-    [ExcelFact]
-    public void CanFindInTable()
-    {
-        table[2, 0].Value = "Find!";
-        table[2, 1].Value = "Find this!";
-        table[2, 2].Value = "Find that!";
-
-
-        var cells = table.Find("Find");
-        Assert.Collection(cells, item => Assert.Equal("Find!", item.Value),
-            item => Assert.Equal("Find this!", item.Value),
-            item => Assert.Equal("Find that!", item.Value));
-        Assert.Equal(0, table.Find("Значение").First().ParentColumn.Index);
-        Assert.Equal(3, table.Rows[2].Find("Find").Count());
-        Assert.Empty(table.Columns[1].Find("Пусто"));
-    }
-
-    [ExcelFact]
-    public void CanAddColumns()
-    {
-        int originalCount = table.Columns.Count();
-        table.Columns[1].AddLeft();
-        Assert.Equal(originalCount + 1, table.Columns.Count());
-    }
-
-    public void Dispose()
-    {
-        Util.Application.ActiveWindow.Close(SaveChanges: false);
-    }
-}
diff --git a/RhSolutions.sln b/RhSolutions.sln
index 8db9bf3..8d94b9b 100644
--- a/RhSolutions.sln
+++ b/RhSolutions.sln
@@ -7,8 +7,6 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "RhSolutions.AddIn", "RhSolu
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "RhSolutions.Tests", "RhSolutions.Tests\RhSolutions.Tests.csproj", "{6EECCDDB-741C-404A-874F-BB8656265162}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "RhSolutions.ExcelExtensions", "RhSolutions.ExcelExtensions\RhSolutions.ExcelExtensions.csproj", "{ADB862A8-5CC6-4509-A4F7-9907E84F5801}"
-EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -23,10 +21,6 @@ Global
 		{6EECCDDB-741C-404A-874F-BB8656265162}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{6EECCDDB-741C-404A-874F-BB8656265162}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{6EECCDDB-741C-404A-874F-BB8656265162}.Release|Any CPU.Build.0 = Release|Any CPU
-		{ADB862A8-5CC6-4509-A4F7-9907E84F5801}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{ADB862A8-5CC6-4509-A4F7-9907E84F5801}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{ADB862A8-5CC6-4509-A4F7-9907E84F5801}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{ADB862A8-5CC6-4509-A4F7-9907E84F5801}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE