public Result <string> AddUser(UserDTO userDTO)
        {
            var ret  = new Result <string>();
            var user = new User();

            try
            {
                user = userDTO.DTO2User();
                Db.Insert(user);
            }
            catch (Exception ex)
            {
                ret.Message = ex.Message;
                ret.Status  = Status.Error;
                return(ret);
            }

            ret.Data   = user.Id;
            ret.Status = Status.Success;
            return(ret);
        }