OnValueChanged Method

Raises the ValueChanged event after the Value property has been changed.

Syntax

Visual Basic

protected virtual void OnValueChanged( 
   EventArgs e
)

C#

'Declaration
 
Protected Overridable Sub OnValueChanged( _
   ByVal e As EventArgs _
) 

 

Parameters

e

An System.EventArgs that provides data for the event.

Remarks

Raising an event invokes the event handler through a delegate.

The OnValueChanged method also allows derived classes to handle the event without attaching a delegate. This is the preferred technique for handling the event in a derived class.

Notes to Inheritors: When overriding OnValueChanged in a derived class, be sure to call the base class's OnValueChanged method so that registered delegates receive the event.

Example

This example uses the ValueChanged event to display the control's new value when it changes.

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.

Private Sub ultraCalendarCombo1_ValueChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ultraCalendarCombo1.ValueChanged

    Dim valueString As String = "Nothing"
    If (Not Me.ultraCalendarCombo1.Value Is Nothing) Then
        valueString = Me.ultraCalendarCombo1.Value
    End If

    Debug.WriteLine("The new value is: '" + valueString + "'")

End Sub

'Declaration
 
Protected Overridable Sub OnValueChanged( _
   ByVal e As EventArgs _
) 

 

private void ultraCalendarCombo1_ValueChanged(object sender, System.EventArgs e)
{

	string valueString = "null";

	if ( this.ultraCalendarCombo1.Value != null )
		valueString = this.ultraCalendarCombo1.Value.ToString();

	System.Diagnostics.Debug.WriteLine("The new value is: '" + valueString + "'");

}

'Declaration
 
Protected Overridable Sub OnValueChanged( _
   ByVal e As EventArgs _
) 

 

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