private void UserControl_Loaded(object sender, RoutedEventArgs e)
        {
            u = new Person();
            //IsolatedStorageSettings.ApplicationSettings["User"] = "";
            //IsolatedStorageSettings.ApplicationSettings["Answered"] = "";

            Answered = ((IsolatedStorageSettings.ApplicationSettings["Answered"] != null)&&(IsolatedStorageSettings.ApplicationSettings["Answered"].ToString()!=String.Empty));

            if (IsolatedStorageSettings.ApplicationSettings["User"] != null)
            {
                userXML = IsolatedStorageSettings.ApplicationSettings["User"].ToString();

            }
            if (userXML != String.Empty)
            {
                setUser();
            }
        }
        void setUser()
        {
            try
            {
                XDocument xmlFeed = XDocument.Parse(userXML);

                u = (from gs in xmlFeed.Descendants("Person")
                     select new Person
                     {
                         UserID = new Guid(gs.Element("UserID").Value),
                         Name = gs.Element("Name").Value
                     }).Single();

                ShowQuestions();
            }
            catch { }
        }