private async void btnSave_Click(object sender, RoutedEventArgs e)
        {
            Debug.WriteLine("Saving questions...");
            QuestionList qList = new QuestionList();

            String[] questions = new String[3];
            questions[0]    = txtQuestion1.Text;
            questions[1]    = txtQuestion2.Text;
            questions[2]    = txtQuestion3.Text;
            qList.Questions = new List <String>(questions);

            Debug.WriteLine("Questions: " + qList.ToJson());

            Windows.Storage.StorageFolder storageFolder = Windows.Storage.ApplicationData.Current.LocalFolder;
            Windows.Storage.StorageFile   questionsFile = await storageFolder.CreateFileAsync(QUESTIONS_FILE, Windows.Storage.CreationCollisionOption.ReplaceExisting);

            await Windows.Storage.FileIO.WriteTextAsync(questionsFile, qList.ToJson());

            this.loadQuestionsFromStorage();
        }
        private async void loadQuestionsFromStorage()
        {
            try
            {
                Windows.Storage.StorageFolder storageFolder = Windows.Storage.ApplicationData.Current.LocalFolder;
                Windows.Storage.StorageFile   questionsFile = await storageFolder.GetFileAsync(QUESTIONS_FILE);

                String questionsJson = await Windows.Storage.FileIO.ReadTextAsync(questionsFile);

                QuestionList questionsList = DementiaApp.QuestionList.FromJson(questionsJson);
                Debug.WriteLine("Read stored questions: " + questionsList.ToJson());

                txtQuestion1.Text = questionsList.Questions[0];
                txtQuestion2.Text = questionsList.Questions[1];
                txtQuestion3.Text = questionsList.Questions[2];
            }
            catch
            {
                Debug.WriteLine("Exception trying to read file " + QUESTIONS_FILE);
            }
        }