Saving Persistent State

Persistent state is usually stored whenever transient state is stored. In addition, your app should save its persistent state when it is closing, by subscription to the PhoneApplicationService.Closing event. Persistent state may include files or application settings, as shown in the following excerpt from the App class:

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void Application_Closing(object sender, ClosingEventArgs e)
{
    System.IO.IsolatedStorage
        .IsolatedStorageSettings.ApplicationSettings["someObject Key"]
             = someObject;
}