ASP.NET MVC5验证Remote Validation，遇到断点进不去定义的方法

  @using (Html.BeginForm("RegisterUser", "Register")) { 
               table style=" width:100%; border-collapse:separate; border-spacing:0px 20px; ">
                   tr>
                       td class="RegisterTd">邮箱td>
                       td>input class="InputTR" name="Email" placeholder=" 需要通过邮件激活账户" value="@(Model != null ? Model.Email : "")" />td>

                   tr>
                   tr>td>td>td style="color:red">@Html.ValidationMessageFor(m => m.Email)td>tr>
                   tr>
                       td class="RegisterTd">用户名td>
                       td>@Html.TextBoxFor(model => model.UserName,  new { @placeholder = " 不少于4个字符", @class= "InputTR" })td> 
                   tr>
                   tr>td>td>td style="color:red">@Html.ValidationMessageFor(m => m.UserName)td>tr>
                   tr>
                       td class="RegisterTd">显示昵称td>
                       td>@Html.TextBoxFor(model => model.ShowUserName, new { @placeholder = " 不少于4个字符", @class = "InputTR" })td>

                   tr>
                   tr>td>td>td style="color:red">@Html.ValidationMessageFor(m => m.ShowUserName)td>tr>
                   tr>
                       td class="RegisterTd">密码td>
                       td>input type="password" class="InputTR" name="PassWord" placeholder=" 至少8位，并包含字母、数字和特殊字符中的两种" value="@(Model != null ? Model.PassWord : "")" />td>

                       td>td>
                   tr>
                   tr>td>td>td style="color:red">@Html.ValidationMessageFor(m => m.PassWord)td>tr>
                   tr>
                       td class="RegisterTd">确认密码td>
                       td>input type="password" class="InputTR" name="ConfirmPwd" placeholder=" 请输入确认密码" value="@(Model != null ? Model.ConfirmPwd : "")" />td>

                   tr>
                   tr>  td>td>td style="color:red">@Html.ValidationMessageFor(m => m.ConfirmPwd)td>tr>
                   tr>
                       td>td>
                       td>input type="submit" style="width:100px; height:30px; background-color:#00CCFF;border:0;letter-spacing:10px; color:#fff;" value="注册" />td>

                   tr>
               table>


               }

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Web;
using System.Web.Mvc;
namespace PicManager.Models
{
    public class User
    {
        [Key]
        public int UserId { get; set; }
        [Required(ErrorMessage ="用户名不能为空")]
        [MinLength(4,ErrorMessage ="至少4个字符")] 
        [Remote("IsHaveUName", "Register", ErrorMessage ="用户名已存在", HttpMethod = "POST")]
        public string UserName { get; set; }
        [Required(ErrorMessage ="昵称不能为空")]
        [MinLength(4,ErrorMessage ="至少4个字符")]
        [Remote("IsHaveSName", "Register", ErrorMessage = "昵称已存在",HttpMethod ="POST")]
        public string ShowUserName { get; set; }
        [Required(ErrorMessage ="密码不能为空")]
        [RegularExpression(@"^(?=.*[a-zA-Z])(?=.*\d)(?=.*[#@!~%^&*.])[a-zA-Z\d#@!~%^&*.]{8,}$",ErrorMessage ="密码不符合要求")]
        public string PassWord { get; set; }
        [Required(ErrorMessage ="确认密码不能为空")]
        [System.ComponentModel.DataAnnotations.Compare("PassWord",ErrorMessage ="两次密码输入不一致")]
        public string ConfirmPwd { get; set; }
        [Required(ErrorMessage ="邮箱不能为空")]
        [RegularExpression(@"[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}",ErrorMessage ="邮箱格式不正确")]
        public string Email { get; set; }
        public int Status { get; set; }
        public string Code { get; set; }
        public DateTime CreatTime{ get; set; }
           

    }
}

     [OutputCache(Location = OutputCacheLocation.None, NoStore = true)]//加上清除缓存
        public ActionResult IsHaveUName(string UserName) {

            var query = from u in db.User
                        where u.UserName == UserName
                        select u;
            if (query.Count()>0)
            {
                return Json(false, JsonRequestBehavior.AllowGet);
            }

            return Json(true, JsonRequestBehavior.AllowGet);
        }
        [OutputCache(Location = OutputCacheLocation.None, NoStore = true)]//加上清除缓存
        public ActionResult IsHaveSName(string ShowUserName)
        {

            var query = from u in db.User
                        where u.ShowUserName == ShowUserName
                        select u;
            if (query.Count() > 0)
            {
                return Json(false, JsonRequestBehavior.AllowGet);
            }

            return Json(true, JsonRequestBehavior.AllowGet);
        }