mvc ajax登录验证

function back(data) {
            if (data.Status == 0) {
                alert(data.Msg);
                return;
            }
            if (data.Status == 1) {
                alert(data.Msg);
                window.location.href = "/Home/Index";
            }
        }

 public class Ajax
    {
        //提示信息
        public string Msg { get; set; }
        //状态 0失败   1成功
        public int Status { get; set; }
    }

  public ActionResult Login_Ajax(UserLogin user)
        {
            if (!ModelState.IsValid)
            {
                return RedirectToAction("Login");
            }
            else
            {
                var User= db.Query(i => i.UserEmail == user.UserEmail && i.UserPwd == user.UserPwd);
                if (LoginUserPwd(user.UserEmail,user.UserPwd))
                {
                    user.UserName = User.UserName;
                    SessionHelp.SessionHelpe.SetSession("user", user.UserName);
                    Ajax ajax = new Ajax() { Status = 1, Msg = "登录成功" };
                    return Json(ajax);  
                }
                else
                {
                    Ajax ajax = new Ajax() { Status = 0, Msg = "账号或密码错误！" };
                    return Json(ajax);                 
                }
            }
        }



//判断账号密码是否正确
 public bool LoginUserPwd(string UserEmail,string UserPwd)
        {
            var user = db.Query(i => i.UserEmail == UserEmail && i.UserPwd == UserPwd);
            if (user==null)
            {
                return false;
            }
            else
            {
                return true;
            }
        }