July 26, 2012
Occurs when the application is exiting.
Assembly: Microsoft.Phone (in Microsoft.Phone.dll)
XMLNS for XAML: Not mapped to an xmlns.
This event is raised when the user uses the Back button to navigate backwards past the first page of the application. Handle this event by saving persistent state, such as settings and user data, to isolated storage. For more information about handling this event, see Execution Model for Windows Phone.