//--- Open existing spreadsheet
          ExcelApplication xla = new ExcelApplication();
          Workbook wb = xla.Open(@"C:\MySpreadsheet.xls");

          //--- Get SheetProtection
          SheetProtection protection = wb[0].SheetProtection;

          //--- Set Properties
          protection.AllowFormatCells = true;
          protection.AllowSort = false;

        

          '--- Open existing spreadsheet
          Dim xla As New ExcelApplication()
          Dim wb As Workbook = xla.Open("C:\MySpreadsheet")

          '--- Get SheetProtection
          Dim protection As SheetProtection = wb(0).SheetProtection

          '--- Set Properties
          protection.AllowFormatCells = true;
          protection.AllowSort = false;