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28 lines
1.5 KiB
Markdown
28 lines
1.5 KiB
Markdown
---
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title: "How to: Find the Source Element in an Event Handler"
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ms.date: "03/30/2017"
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dev_langs:
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- "csharp"
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- "vb"
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helpviewer_keywords:
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- "source element in event handlers [WPF]"
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- "event handlers [WPF], finding source element in"
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ms.assetid: 85f71c5a-b714-4c65-9711-7d905c2bbe98
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---
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# How to: Find the Source Element in an Event Handler
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This example shows how to find the source element in an event handler.
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## Example
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The following example shows a <xref:System.Windows.Controls.Primitives.ButtonBase.Click> event handler that is declared in a code-behind file. When a user clicks the button that the handler is attached to, the handler changes a property value. The handler code uses the <xref:System.Windows.RoutedEventArgs.Source%2A> property of the routed event data that is reported in the event arguments to change the <xref:System.Windows.FrameworkElement.Width%2A> property value on the <xref:System.Windows.RoutedEventArgs.Source%2A> element.
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[!code-xaml[RoutedEventSource#XAMLHandler](~/samples/snippets/csharp/VS_Snippets_Wpf/RoutedEventSource/CSharp/default.xaml#xamlhandler)]
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[!code-csharp[RoutedEventSource#Handler](~/samples/snippets/csharp/VS_Snippets_Wpf/RoutedEventSource/CSharp/default.xaml.cs#handler)]
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[!code-vb[RoutedEventSource#Handler](~/samples/snippets/visualbasic/VS_Snippets_Wpf/RoutedEventSource/VisualBasic/default.xaml.vb#handler)]
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## See also
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- <xref:System.Windows.RoutedEventArgs>
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- [Routed Events Overview](routed-events-overview.md)
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- [How-to Topics](events-how-to-topics.md)
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