title: C# Excel Interop: Opening and Showing CSV file
body: <p>Hey I'm writing a wrapper for the excel interop, I want to be able to open a csv file in excel and show it to the user.  I've got the basics down, but when i set visible to true and excel shows up, all columns are jammed into the first, and the separating commas are showing.</p>
  
  <p>here's my helper.</p>
  
  <pre><code>    public MyExcel(string filePath, bool readOnly)
      {
          _app = new Excel.Application();
  
          _workbooks = _app.Workbooks;
  
          _workbook = _workbooks.Open(_filepath, 0, _readOnly, 5, "", "", true, Excel.XlPlatform.xlWindows, "\t", !_readOnly, false, 0, true, true, true);
      }
  
      public void Show()
      {
          _app.Visible = true;
      }
  </code></pre>
  
  <p>any suggestions? </p>
  
  <p>When i open the file by double clicking Excel processes everything properly.</p>