private void AddQuestion()
        {
            if (QuestionToAdd == null)
            {
                return;
            }
            if (QuestionItems.Select(q => q.QuestionId).Contains(QuestionToAdd.Id))
            {
                return;
            }
            var newQ = new QuestionItem {
                Question = QuestionToAdd.Question, QuestionList = QuestionList
            };

            Context.QuestionItems.Add(newQ);
            Context.SaveChanges();
            QuestionItems.Add(new QuestionItemViewModel(Context, newQ));
        }
 private void RemoveQuestion()
 {
     SelectedQuestionItem.Destroy();
     QuestionItems.Remove(SelectedQuestionItem);
 }