OnBeforeDropDown Method (UltraCombo)

Called before the list is dropped down

Syntax

Visual Basic

'Declaration
 
Protected Overridable Sub OnBeforeDropDown( _
   ByVal e As CancelEventArgs _
) 

C#

protected virtual void OnBeforeDropDown( 
   CancelEventArgs e
)

Parameters

e

Example

Following code illustrates how one can use BeforeDropDown event to prevent the user from dropping down an UltraCombo's drop down by canceling the event.

For an overview of how to handle events in Visual Basic or Visual C#, see Event Handlers in Visual Basic and Visual C#. For specific information and code examples illustrating how to consume events in your application, see Consuming Events in the .NET Framework Developer's Guide.

Visual Basic

Imports Infragistics.Shared
Imports Infragistics.Win
Imports Infragistics.Win.UltraWinGrid

  Private Sub UltraCombo1_BeforeDropDown(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles ultraCombo1.BeforeDropDown

      Dim allowDropDown As Boolean = True

      If Not allowDropDown Then
          ' Set Cancel to true to prevent the ultra combo from dropping down.
          e.Cancel = True
      End If

  End Sub

C#

using Infragistics.Shared;
using Infragistics.Win;
using Infragistics.Win.UltraWinGrid;
using System.Diagnostics;

private void ultraCombo1_BeforeDropDown(object sender, System.ComponentModel.CancelEventArgs e)
{

	bool allowDropDown = true;

	if ( !allowDropDown )
	{
		// Set Cancel to true to prevent the ultra combo from dropping down.
		e.Cancel = true;
	}

}

Requirements

Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2