public IEnumerable <Response> GetQuestionResponses(string id)
        {
            var responses = _repo.GetResponsesByQuestionId(id);

            if (responses == null)
            {
                throw new Exception("Bad Question ID");
            }
            return(responses);
        }
        internal IEnumerable <Response> GetRepsonsesByQuestionId(int id)
        {
            IEnumerable <Response> data = _repo.GetResponsesByQuestionId(id);

            if (data == null)
            {
                throw new Exception("Invalid Id");
            }
            return(data);
        }