/// <summary>
 /// Add new Answer
 /// </summary>
 /// <param name="answer"></param>
 /// <returns></returns>
 public AnswerDTO Add(AnswerDTO answer)
 {
     try
     {
         answer.Id         = Guid.NewGuid();
         answer.UploadDate = DateTime.Now;
         answer.EditDate   = answer.UploadDate;
         return(answerData.Add(answer));
     }
     catch
     {
         return(null);
     }
 }