How to Handle Empty ComboBox in Windows Forms Grid Control

18 Nov 20181 minute to read

If a ComboBox is neither bound to any datasource nor has list items, it can be notified to the user by clicking on it. The notification message that the user wants to display can be given as shown in the following TableControlCurrentCellShowingDropDown event.

C#

//Code..
void gridGroupingControl1_TableControlCurrentCellShowingDropDown(object sender, GridTableControlCurrentCellShowingDropDownEventArgs e)
{
GridComboBoxCellRenderer rend = e.TableControl.CurrentCell.Renderer as GridComboBoxCellRenderer;
  ListBox list = rend.ListBoxPart;
  if (list.Items.Count == 0)
  {
    // write your code here..
  }
}
//Code..

VB.NET

'Code..
void gridGroupingControl1_TableControlCurrentCellShowingDropDown(Object sender, GridTableControlCurrentCellShowingDropDownEventArgs e)
Dim rend As GridComboBoxCellRenderer = TryCast(e.TableControl.CurrentCell.Renderer, GridComboBoxCellRenderer)
  Dim list As ListBox = rend.ListBoxPart
  If list.Items.Count = 0 Then
  ' write your code here..
  End If
'Code..