/// <summary>
 /// Delete Question
 /// </summary>
 /// <param name="questionID"></param>
 /// <returns></returns>
 public QuestionDTO Delete(Guid questionID)
 {
     try
     {
         return(questionData.Delete(questionID));
     }
     catch (NoSuchQuestionFound)
     {
         throw new NoSuchQuestionFound();
     }
     catch
     {
         return(null);
     }
 }