# 185 - WP7: Learning how to handle Tombstoning

Level: Intermediate
Tags: Windows Phone 7
Derik Whittaker
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In this episode we are going to take a look at how to handle tombstoning (when your application is not longer in focus, but is not shut down yet) in your WP7 application.

When building out a WP7 application it is critical that your application can handle Tombstoning and rebuild itself as needed. This is to allow the user to have their work flow interrupted by an action, but still gives them the ability to back into your app and resume from there last usage point. In fact if you fail to take Tombstoning into account your application will fail certification.

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