How to skip deleting the cell text of an exclusive ComboBox cell in WinForms GridControl?

// On Form load
this.gridControl1.CurrentCellKeyDown += new KeyEventHandler(gridControl1_CurrentCellKeyDown);
void gridControl1_CurrentCellKeyDown(object sender, KeyEventArgs e)
{
   GridCurrentCell cc = this.gridControl1.CurrentCell;
   if (cc.Renderer.StyleInfo.CellType == "ComboBox" && cc.Renderer.StyleInfo.DropDownStyle == GridDropDownStyle.Exclusive)
   {
      // Pressing delete key or backspacekey
      if (e.KeyCode == Keys.Back || e.KeyCode == Keys.Delete)
      {
         // not remove the cell content
         e.Handled = true;
      }
   }
}

‘On Form load
AddHandler gridControl1.CurrentCellKeyDown, AddressOf gridControl1_CurrentCellKeyDown
' to perform action while pressing key
Private Sub gridControl1_CurrentCellKeyDown(ByVal sender As Object, ByVal e As KeyEventArgs)
    Dim cc As GridCurrentCell = Me.gridControl1.CurrentCell
    If cc.Renderer.StyleInfo.CellType Is "ComboBox" AndAlso  cc.Renderer.StyleInfo.DropDownStyle = GridDropDownStyle.Exclusive Then
      ' Pressing delete key or backspacekey
      If e.KeyCode = Keys.Back OrElse e.KeyCode = Keys.Delete Then
        ' not remove the cell content
        e.Handled = True
      End If
    End If
End Sub