title: Insert Columns between columns in excel
body: <p>I have an Excel File in which I have number of columns. Now I need to insert columns for example between "C" and "D".. so that the resulting columns should be "C" ,"New Column(D)", "E".. Please help me with this..</p>
  
  <p>Parts of Code to open the Excel file is as below...</p>
  
  <pre><code>Microsoft.Office.Interop.Excel.Application application = new Microsoft.Office.Interop.Excel.Application();
  Microsoft.Office.Interop.Excel.Workbook workbook = application.Workbooks.Open(txtDestination.Text.ToString() + "\\" + Path.GetFileName(File_Name, Type.Missing, Type.Missing, Type.Missing, Type.Missing,
                      Type.Missing, Type.Missing, Type.Missing, Type.Missing,
                      Type.Missing, Type.Missing, Type.Missing, Type.Missing,
                      Type.Missing, Type.Missing);
  Worksheet worksheet = (Worksheet)workbook.ActiveSheet;
  </code></pre>