public string SaveQuestionAnswer(QuestionAnswerViewModel vm)
 {
     string userid = User.Identity.GetUserId();
     vm.CreatedBy = userid;
     vm.ModifiedBy = userid;
     return _repo.CustomSave(vm);
 }
 public string SaveQuestionAnswer(QuestionAnswerViewModel vm)
 {
     return _repo.CustomSave(vm);
 }