Handling Page Navigation
The PhoneApplicationPage extends the System.Windows.Controls.Page class, which has a number of virtual methods called when the page is brought into view or removed from view by the PhoneApplicationFrame (see Figure 3.7).
FIGURE 3.7 PhoneApplicationPage inherits page navigation methods.
The OnNavigatingFrom method is called before a page is removed from view by the PhoneApplicationFrame, and the OnNavigatedFrom method is called after navigation occurs. Conversely, the OnNavigatedTo method is called when the frame brings the page into view.
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