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30 lines
1.9 KiB
Markdown
30 lines
1.9 KiB
Markdown
---
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title: "How to: Add a Watermark to a TextBox"
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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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- "displaying a background image inside a text box to aid user input [WPF]"
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- "aid usability of a TextBox using a background image [WPF]"
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ms.assetid: df89bdd8-a0fb-45e0-b312-dd53332d01a8
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---
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# How to: Add a Watermark to a TextBox
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The following example shows how to aid usability of a <xref:System.Windows.Controls.TextBox> by displaying an explanatory background image inside of the <xref:System.Windows.Controls.TextBox> until the user inputs text, at which point the image is removed. In addition, the background image is restored again if the user removes their input. See illustration below.
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> [!NOTE]
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> The reason a background image is used in this example rather then simply manipulating the <xref:System.Windows.Controls.TextBox.Text%2A> property of <xref:System.Windows.Controls.TextBox>, is that a background image will not interfere with data binding.
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## Example
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[!code-xaml[TextBoxMiscSnippets_snip#TextBoxBackgroundExampleWholePage](~/samples/snippets/csharp/VS_Snippets_Wpf/TextBoxMiscSnippets_snip/csharp/textbox_with_background_image.xaml#textboxbackgroundexamplewholepage)]
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[!code-csharp[TextBoxMiscSnippets_snip#TextBoxBackgroundCodeExampleWholePage](~/samples/snippets/csharp/VS_Snippets_Wpf/TextBoxMiscSnippets_snip/csharp/textbox_with_background_image.xaml.cs#textboxbackgroundcodeexamplewholepage)]
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[!code-vb[TextBoxMiscSnippets_snip#TextBoxBackgroundCodeExampleWholePage](~/samples/snippets/visualbasic/VS_Snippets_Wpf/TextBoxMiscSnippets_snip/visualbasic/textbox_with_background_image.xaml.vb#textboxbackgroundcodeexamplewholepage)]
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## See also
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- [TextBox Overview](textbox-overview.md)
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- [RichTextBox Overview](richtextbox-overview.md)
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