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Home/ Questions/Q 554257
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Editorial Team
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Editorial Team
Asked: May 13, 20262026-05-13T11:41:27+00:00 2026-05-13T11:41:27+00:00

The default Silverlight project template creates a file called App.xaml. What is this file

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The default Silverlight project template creates a file called “App.xaml”. What is this file used for?

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  1. Editorial Team
    Editorial Team
    2026-05-13T11:41:27+00:00Added an answer on May 13, 2026 at 11:41 am

    There are a couple different uses for this file. Essentially it is a derived class of Application.

    • Global Resource declarations – Using the Application.Resources property you can define application level resources. Such as styles, data templates and
      control templates.
    • Startup, Exit, and Error Handling Events (code-behind) – The code-behind of this file is used to handle application level events such as Startup, Exit and UnhandledException.
    • Application.Current Reference (code-behind) – This application is accessible via the global static variable Application.Current. You can cast this anywhere in your application.
    • Assigning RootVisual (code-behind) – The RootVisual is used to setup the startup Silverlight UserControl. This property needs to be set in the Startup event.
    • Install the application Out-Of-Browser (code-behind) – Using the Install method you can prompt the user to install the application Out-of-Browser.
    • Check for Application Updates (code-behind) – The CheckAndDownloadUpdateAsync method is used when the application is running out-of-browser to ensure that the .xap file is the latest.
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