---
title: "How to: Handle the ScrollChanged Event"
ms.date: "03/30/2017"
dev_langs: 
  - "csharp"
  - "vb"
helpviewer_keywords: 
  - "ScrollViewer control [WPF], raising ScrollChanged events"
  - "ScrollChanged events [WPF]"
ms.assetid: 42c695d8-ee28-49d4-80fd-fc71e9be7f29
---
# How to: Handle the ScrollChanged Event
## Example  
 This example shows how to handle the <xref:System.Windows.Controls.ScrollViewer.ScrollChanged> event of a <xref:System.Windows.Controls.ScrollViewer>.  
  
 A <xref:System.Windows.Documents.FlowDocument> element with <xref:System.Windows.Documents.Paragraph> parts is defined in [!INCLUDE[TLA2#tla_xaml](../../../includes/tla2sharptla-xaml-md.md)]. When the <xref:System.Windows.Controls.ScrollViewer.ScrollChanged> event occurs due to user interaction, a handler is invoked, and text is written to a <xref:System.Windows.Controls.TextBlock> indicating that the event has occurred.  
  
 [!code-xaml[scrollchangedeventargsLayout#1](~/samples/snippets/csharp/VS_Snippets_Wpf/scrollchangedeventargsLayout/CSharp/Window1.xaml#1)]  
[!code-xaml[scrollchangedeventargsLayout#2](~/samples/snippets/csharp/VS_Snippets_Wpf/scrollchangedeventargsLayout/CSharp/Window1.xaml#2)]  
  
 [!code-csharp[scrollchangedeventargsLayout#3](~/samples/snippets/csharp/VS_Snippets_Wpf/scrollchangedeventargsLayout/CSharp/Window1.xaml.cs#3)]
 [!code-vb[scrollchangedeventargsLayout#3](~/samples/snippets/visualbasic/VS_Snippets_Wpf/scrollchangedeventargsLayout/VisualBasic/Window1.xaml.vb#3)]  
  
## See also

- <xref:System.Windows.Controls.ScrollViewer>
- <xref:System.Windows.Controls.ScrollViewer.ScrollChanged>
- <xref:System.Windows.Controls.ScrollChangedEventHandler>
- <xref:System.Windows.Controls.ScrollChangedEventArgs>