RhSolutions-AddIn/src/Models/StatusbarBase.cs

using ExcelDna.Integration;
using Microsoft.Office.Interop.Excel;
using System;
using System.Threading;
using System.Threading.Tasks;

namespace RhSolutions.Models
{
    internal abstract class StatusbarBase : IDisposable
    {
        protected Application Excel = RhSolutionsAddIn.Excel;

        public abstract void Update();

        private static void ResetStatusBar()
        {
            RhSolutionsAddIn.Excel.StatusBar = false;
        }

        public void Dispose()
        {
            Task.Delay(5000).ContinueWith(t => ResetStatusBar());
        }
    }
}