public static void FreezePanes(Excel app, Range range)
        {
            range.XlRange.Worksheet.Select();
            range.XlRange.Select();

            ExcelOperations.FreezePanes(app, true);
        }
        public static void ShowGridlines(Excel app, Worksheet ws, bool value)
        {
            ((XL._Worksheet)ws.XlWorksheet).Activate();

            app.XlApplication.ActiveWindow.DisplayGridlines = value;
        }
 public static void ScreenUpdating(Excel app, bool value)
 {
     app.ScreenUpdating = value;
 }
 public static void FreezePanes(Excel app, bool value)
 {
     app.FreezePanes = value;
 }
 public static void DisplayAlerts(Excel app, bool value)
 {
     app.DisplayAlerts = value;
 }