///// <summary>
/// 1.Clear CircleReference
/// 2.Set Page to Fit Wide
/// 3.Set Column Text fit
/// </summary>
/// <param name="app"></param>
/// <param name="ws"></param>
private void WorkSheetPageSet(Microsoft.Office.Interop.Excel.Application app, Worksheet ws)
{
 ClearCircleReference(ws);
 SetPagetoFitWide(ws);
 SetColumnFit(ws);
}
///// <summary>
/// Set Column Text fit
/// </summary>
/// <param name="sheet"></param>
private static void SetColumnFit(Worksheet sheet)
{
 char column = 'B';
 for (int i = 0; i < 25; i++)
 {
  Range range = sheet.get_Range(String.Format("{0}1", column.ToString()),
   String.Format("{0}1", column.ToString()));
  if (range != null)
  {
   range.EntireColumn.AutoFit();
  }
  column++;
 }
}
///// <summary>
/// Clear CircleReference
/// </summary>
/// <param name="sheet">Worksheet object</param>
private void ClearCircleReference(Worksheet sheet)
{
 Range range = sheet.CircularReference;
 while (range != null)
 {
  range.Clear();
  range = sheet.CircularReference;
 }
}
///// <summary>
/// Set Page to Fit Wide
/// </summary>
/// <param name="ws">Worksheet object</param>
private static void SetPagetoFitWide(Worksheet ws)
{
 ws.PageSetup.Zoom = false;
 ws.PageSetup.FitToPagesWide = 1;
 ws.PageSetup.FitToPagesTall = false;
}