How to restrict the operations of delete and backspace key of DateTimePicker in WinForms GridControl?

//MonthCalendar celltype
this.gridControl1[1, 2].Text = "MonthCalendar";
this.gridControl1.ColWidths[2] = 100;
this.gridControl1[2, 2].CellType = GridCellTypeName.MonthCalendar;
//Event Handler
this.gridControl1.CurrentCellKeyDown += gridControl1_CurrentCellKeyDown;
 
 void gridControl1_CurrentCellKeyDown(object sender, KeyEventArgs e)
        {
            //To restrict the operations of delete key.
            int rowIndex = this.gridControl1.CurrentCell.RowIndex;
            int columnIndex = this.gridControl1.CurrentCell.ColIndex;
            if (this.gridControl1[rowIndex,columnIndex].CellType  == GridCellTypeName.MonthCalendar 
                && (e.KeyCode == Keys.Delete))
            {                
                e.Handled = true;
            }
        }
 

'MonthCalendar celltype
 Me.gridControl1(1, 2).Text = "MonthCalendar"
 Me.gridControl1.ColWidths(2) = 100
 Me.gridControl1(2, 2).CellType = GridCellTypeName.MonthCalendar
'Event Handler
 Me.gridControl1.CurrentCellKeyDown += gridControl1_CurrentCellKeyDown
 
Private Sub gridControl1_CurrentCellKeyDown(ByVal sender As Object, ByVal e As KeyEventArgs)
  'To restrict the operations of delete key.
   Dim rowIndex As Integer = Me.gridControl1.CurrentCell.RowIndex
   Dim columnIndex As Integer = Me.gridControl1.CurrentCell.ColIndex
   If Me.gridControl1(rowIndex,columnIndex).CellType Is GridCellTypeName.MonthCalendar AndAlso (e.KeyCode = Keys.Delete) Then
 e.Handled = True
   End If
End Sub