privatevoid testTB_TextChanged(object sender, TextChangedEventArgs e)

{

    ApplicationDataContainer localSettings = ApplicationData.Current.LocalSettings;

    localSettings.Values["value"] = testTB.Text;

}

privatevoid NavigationHelper_LoadState(object sender, LoadStateEventArgs e)

{

    ApplicationDataContainer localSettings = ApplicationData.Current.LocalSettings;

    if (localSettings.Values.ContainsKey("value"))

    {

        testTB.Text = localSettings.Values["value"].ToString();

    }

}

privatevoid NavigationHelper_SaveState(object sender, SaveStateEventArgs e)

{

    e.PageState["value"] = testTB.Text;

}

privatevoid NavigationHelper_LoadState(object sender, LoadStateEventArgs e)

{

    if (e.PageState != null && e.PageState.ContainsKey("value"))

    {

        testTB.Text = e.PageState["value"].ToString();

    }

}