public partial class HomeView : PhoneApplicationPage

{

    public HomeView()

    {

        InitializeComponent();

        Loaded += HomeView_Loaded;

    }

    private void HomeView_Loaded(object sender, RoutedEventArgs e)

    {

        UserAgentHelper.GetUserAgent(

            LayoutRoot,

            userAgent =>

                {

                    // TODO: Store this wherever you want

                    ApplicationSettings.Current.UserAgent = userAgent;

                });

    }

}