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The AutoSelectBehavior automatically selects the entire content of its associated TextBox when it is loaded.
Platform APIs:
AutoSelectBehavior
Example
In this example using the AutoSelectBehavior the textbox content will be automatically selected when it is loaded:
<TextBox Text="My content is selected when loaded">
<interactivity:Interaction.Behaviors>
<behaviors:AutoSelectBehavior />
</interactivity:Interaction.Behaviors>
</TextBox>
Sample Project
AutoSelect behavior sample page Source. You can see this in action in Windows Community Toolkit Sample App.