Restrict operation of delete and backspace key in WinForms Grid.

//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;
 
private void gridControl1_CurrentCellKeyDown(object sender, KeyEventArgs e)
{
    // Restrict delete key for MonthCalendar cells
    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
AddHandler Me.gridControl1.CurrentCellKeyDown, AddressOf 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