public ActionResult CreateAccount(User ac)
        {
            ResponseRegister rp = new ResponseRegister();

            var unitOfWork   = new UnitOfWork(new QLBHDienThoaiEntities());
            var validAccount = unitOfWork.Account.ValidAccount(ac);

            switch (validAccount)
            {
            case -1:
            {
                rp.Acc     = ac;
                rp.Status  = false;
                rp.Message = "Email đã tồn tại";
                return(View("Register", rp));
            }

            case 0:
            {
                rp.Acc     = ac;
                rp.Status  = false;
                rp.Message = "Username đã tồn tại";
                return(View("Register", rp));
            }
            }
            var response = AccountUtils.SendEmail(ac);

            if (response.Status == true)
            {
                ac.Code           = response.Code;
                ac.IsLocked       = true;
                ac.Status         = false;
                ac.EmailConfirmed = false;
                unitOfWork.Account.Add(ac);
                unitOfWork.Complete();
                Session[SessionKey.RegUser] =
                    unitOfWork.Account.GetAccountByUsername(ac.Username, ac.Password);
                return(View("ConfirmEmail"));
            }
            else
            {
                return(RedirectToAction("Register"));
            }
        }