public MainPage() { InitializeComponent(); } PhoneApplicationService phoneAppService = PhoneApplicationService.Current; protected override void OnNavigatedFrom(System.Windows.Navigation.NavigationEventArgs e) { phoneAppService.State["myValue"] = textBox1.Text; base.OnNavigatedFrom(e); } protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e) { object someObject; if (phoneAppService.State.ContainsKey("myValue")) { if (phoneAppService.State.TryGetValue("myValue", out someObject)) { textBox1.Text = someObject.ToString(); } } base.OnNavigatedTo(e); }