OnValueChanged Method (ScrollBarInfo)

Raises the ValueChanged event when the Value property changes.

Syntax

Visual Basic

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

C#

protected virtual void OnValueChanged( 
   EventArgs e
)

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

The following sample code illustrates the information available in the ValueChanged 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.Win
Imports Infragistics.Win.UltraWinScrollBar


Private Sub ultraScrollBar1_ValueChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ultraScrollBar1.ValueChanged

    Dim scrollbar As UltraScrollBar = sender

    If scrollbar.Orientation = Orientation.Vertical Then
        Debug.WriteLine("Vertical scrollbar value changed:")
    Else
        Debug.WriteLine("Horizontal scrollbar value changed:")
    End If

    Debug.WriteLine("New Value: " + scrollbar.Value.ToString())

End Sub

C#

using System.Diagnostics;
using Infragistics.Win;
using Infragistics.Win.UltraWinScrollBar;

private void ultraScrollBar1_ValueChanged(object sender, System.EventArgs e)
{

	UltraScrollBar scrollbar = sender as UltraScrollBar;

	if ( scrollbar.Orientation == Orientation.Vertical )
		Debug.WriteLine( "Vertical scrollbar value changed:");
	else
		Debug.WriteLine( "Horizontal scrollbar value changed:");
		
	Debug.WriteLine( "New Value: " + scrollbar.Value.ToString());

}

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