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In Part 2 of this series, we made progress toward including tombstoning support in a photo-extras application by adding OnNavigatedFrom and OnNavigatedTo methods that use a combination of page state and isolated storage to save the state of our app before it’s deactivated and restore that state following reactivation. But we also determined that work remains to be done. Specifically, our tombstoning code prevented the user from opening another picture. Before we implement a solution, let’s take a moment to understand what’s happening. Start a debug run of the app in the emulator. Select one picture, and
then a second. Now check out the Debug.WriteLine output in Visual Studio’s output window. It should look something like this, minus the comments I added to correlate actions to output: Launching
  …
OnNavigatedTo // Click the Open button
OnNavigatedFrom
Deactivated // Select the first photo
Activated
PhotoChooserTask.Completed
OnNavigatedTo //...(Read whole news on source site)

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Home : Blog List : Jeff Prosise's Blog : Real-World Tombstoning in Silverlight for Windows Phone, Part 3