ASP.NET MVC3 注册用户的有关问题

ASP.NET MVC3 注册用户的问题。
Action:

C# code

        public ActionResult Register()        {            if (Session["userid"] != null)            {                ViewBag.Error = "你已经登陆";                return RedirectToAction("Index", "Home");            }            else            {                return View();            }        }        [HttpPost]        public ActionResult Register(FormCollection RegUser)        {            var model = new Blog.Models.User()            {                UserName = RegUser["UserName"].ToLower().Trim(),                Email = RegUser["Email"].ToLower().Trim(),                Password = RegUser["Password"].toMD5(),                QQ = RegUser["QQ"].Trim(),                RegTime = DateTime.Now,                LastLoginTime = DateTime.Now,                RegIP = Request.UserHostAddress,                LastLoginIP = Request.UserHostAddress,                RoleID = 1            };            var dal = new BlogEnt();            dal.Users.Add(model);            dal.SaveChanges();            int id = model.UserID;            Session["userid"] = id;            return RedirectToAction("Index", "Home");        }        #endregion

VIEW:

C# code

@using (Html.BeginForm()) {    @Html.ValidationSummary(true)        <h2>注册用户</h2>        <div class="editor-label">            @Html.LabelFor(model => model.UserName)        </div>        <div class="editor-field">            @Html.EditorFor(model => model.UserName)<span>*必填.用于在网站中显示名称</span>            @Html.ValidationMessageFor(model => model.UserName)        </div>        <div class="editor-label">            @Html.LabelFor(model => model.Email)        </div>        <div class="editor-field">            @Html.EditorFor(model => model.Email)<span>*用于登陆网站和找回密码</span>            @Html.ValidationMessageFor(model => model.Email)        </div>               <div class="editor-label">            @Html.LabelFor(model => model.Password)        </div>        <div class="editor-field">            @Html.EditorFor(model => model.Password)<span>*</span>            @Html.ValidationMessageFor(model => model.Password)        </div>        <p>            <input type="submit" value="提交注册" />        </p>}

原先是这样可以注册的，但是最近不知道什么地方出了问题，就不能注册了。就一直报这个错误：未将对象引用到实例。
如图


可是这个地方，断点又不好调试。



[解决办法]
断点,肯定可以设的吧.

只是方法调试的问题了.

上面的出错,UserName这个可能不存在引起的.
[解决办法]

C# code

var model = new Blog.Models.User();model.UserName=... 

 

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