public bool Login(LoginDTO dto)
        {
            var user = _uWork.UserRepo.FindByUsernameAndPass(dto.Username, dto.Password);
            if (user == null)
                return false;

            HttpContext.Current.Session["User"] = user;
            return true;
        }
        public ActionResult Login(LoginDTO dto)
        {
            ViewBag.Error = null;
            if (ModelState.IsValid)
            {
                var login = _accService.Login(dto);
                //if user is loged in send him to welcome page
                if (login)
                    return RedirectToAction("Welcome", "Home");

                //else return error message to view
                ViewBag.Error = "Username or password not correct";
                return View();
            }
            return View();
        }