public ActionResult Account(User u)
        {
            using (var context=new HenXinSMSContext())
            {
                string _username = Request["UserName"];
                string  _password= Request["PassWord"];
                var _users = context.Users;
                if(_users.Any())
                {
                    var _user = _users.Find(_username);
                    if(_user==null)
                    {
                        return Content("no:用户名不存在！");
                    }
                    else if(_user.PassWord==_password)
                    {
                       // TempData["ddd"]  = _username;
                        Session["UserName"] = _username;
                        return Content("ok:/Home/Index");
                       //return RedirectToAction("Index","Home",new{ u=u.UserName});
                       //return RedirectToAction("Index","Home");
                        //Response.Redirect("/Home/Index");
                    }
                    else
                    {
                        return Content("no:用户名或密码错误！");
                    }
                }
            }
            return Content("no:访问数据库失败，请联系管理员！");
        }
       }