diff --git a/Source/DataWriter/DataWriter.cs b/Source/DataWriter/DataWriter.cs
new file mode 100644
index 0000000..76ed4ff
--- /dev/null
+++ b/Source/DataWriter/DataWriter.cs
@@ -0,0 +1,107 @@
+using ExcelDna.Integration;
+using Microsoft.Office.Interop.Excel;
+using Rehau.Sku.Assist;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.IO;
+
+namespace Rehau.Sku
+{
+    public class DataWriter : IDisposable
+    {
+        private Application xlApp;
+        private Dictionary<string, double> SkuAmount { get; set; }
+        private object[,] SelectedCells { get; set; }
+        private string FileName { get; set; }
+        private string ExportFileName { get; set; }
+
+        public DataWriter()
+        {
+            this.xlApp = (Application)ExcelDnaUtil.Application;
+            this.FileName = this.xlApp.ActiveWorkbook.FullName;
+
+            GetSelectedCells();
+        }
+
+        private void GetSelectedCells()
+        {
+            Range selection = xlApp.Selection;
+            this.SelectedCells = (object[,])selection.Value2;
+        }
+
+        public bool IsRangeValid()
+        {
+            return SelectedCells != null &&
+                SelectedCells.GetLength(1) == 2;
+        }
+
+        public void FillSkuAmountDict()
+        {
+            SkuAmount = new Dictionary<string, double>();
+            int rowsCount = SelectedCells.GetLength(0);
+
+            for (int row = 1; row <= rowsCount; row++)
+            {
+                if (SelectedCells[row, 1] == null || SelectedCells[row, 2] == null)
+                    continue;
+
+                string sku = null;
+                double? amount = null;
+
+                for (int column = 1; column <= 2; column++)
+                {
+                    object current = SelectedCells[row, column];
+
+                    if (current.GetType() == typeof(string)
+                        && SkuAssist.IsRehauSku((string)current))
+                        sku = (string)current;
+
+                    else if (current.GetType() == typeof(string)
+                        && double.TryParse((string)current, out _))
+                        amount = double.Parse((string)current);
+
+                    else if (current.GetType() == typeof(double))
+                        amount = (double)current;
+                }
+
+                if (sku == null || amount == null)
+                    continue;
+
+                if (SkuAmount.ContainsKey(sku))
+                    SkuAmount[sku] += amount.Value;
+                else
+                    SkuAmount.Add(sku, amount.Value);
+            }
+        }
+
+        public void DownloadPriceList()
+        {
+            Uri linkToPrice = new Uri(@"https://www.rehau.com/downloads/831332/%D0%BF%D1%80%D0%B0%D0%B9%D1%81-%D0%BB%D0%B8%D1%81%D1%82-%D0%B2%D0%B8%D1%81-exel-2021.xlsm");
+
+            if (FileName.Contains(':'))
+                ExportFileName = string.Join(".", FileName.Split('.').Select((x, i) => i == 0 ? string.Concat(x, "~") : "xlsm"));
+            else
+                ExportFileName = Environment.GetFolderPath(Environment.SpecialFolder.Desktop) + @"\Прайс-лист REHAU.xlsm";
+
+            HttpClientUtil.DownloadFile(linkToPrice, ExportFileName);
+        }
+
+        public void GetPriceListWB()
+        {            
+            Workbook wb = xlApp.Workbooks.Open(ExportFileName);
+        }
+
+        public void Dispose()
+        {
+            Dispose(true);
+            GC.SuppressFinalize(this);
+        }
+
+        protected virtual void Dispose(bool disposing)
+        {
+
+        }
+    }
+}
+
diff --git a/Source/DataWriter/RibbonController.cs b/Source/DataWriter/RibbonController.cs
new file mode 100644
index 0000000..a9eedb5
--- /dev/null
+++ b/Source/DataWriter/RibbonController.cs
@@ -0,0 +1,26 @@
+using System.Runtime.InteropServices;
+using System.Windows.Forms;
+using ExcelDna.Integration.CustomUI;
+
+namespace Ribbon
+{
+    [ComVisible(true)]
+    public class RibbonController : ExcelRibbon
+    {
+        public override string GetCustomUI(string RibbonID)
+        {
+            return @"
+      <customUI xmlns='http://schemas.microsoft.com/office/2006/01/customui'>
+      <ribbon>
+        <tabs>
+          <tab id='tab1' label='REHAU'>
+            <group id='group1' label='Прайс-лист'>
+              <button id='button1' label='Экспорт' onAction='OnButtonPressed'/>
+            </group >
+          </tab>
+        </tabs>
+      </ribbon>
+    </customUI>";
+        }
+    }
+}