asp.net Cookie 用户登陆时记住我

        /// <summary>
        /// 判断Cookie中存储的数据
        /// </summary>
        protected void CheckUserCookie()
        {
            //先判断Cookie是否有值
            if (Request.Cookies["cp1"] != null && Request.Cookies["cp2"] != null)
            {
                //校验数据是否正确.
                string cookieUserName = Request.Cookies["cp1"].Value;
                string cookieUserPwd=Request.Cookies["cp2"].Value;
                BLL.UserManager bll = new BLL.UserManager();
                Model.User model=bll.GetModel(cookieUserName);//根据Cookie中存储的用户名找用户
                if (model != null)
                {
                    //判断密码是否正确.
                    //如果注册时，采用相同的加密方式，那么这里再比较时直接比较
                    if (Enctry(model.LoginPwd) == cookieUserPwd)
                    {
                        Session["UserInfo"] = model;
                        GoPage("登录成功");
                    }
                    else//表示密码错误,删除Cookie
                    {
                        Response.Cookies["cp1"].Expires = DateTime.Now.AddDays(-);
                        Response.Cookies["cp2"].Expires = DateTime.Now.AddDays(-);
                    }
                }
            }
        }
        /// <summary>
        /// 校验用户登录信息
        /// </summary>
        protected void CheckUserLogin()
        {
            string txtName=Request.Form["txtName"];
            string txtPwd=Request.Form["txtPwd"];
            BLL.UserManager bll = new BLL.UserManager();
            string msg = string.Empty;
            Model.User model = null;
            //校验用户名密码
           bool b= bll.UserLogin(txtName, txtPwd,out msg,out model);
           if (b)
           {
               Session["UserInfo"] = model;
               //如果选择了记住我复选框，将用户的信息写到Cookie。
               if (!string.IsNullOrEmpty(Request.Form["checkMe"]))
               {
                   HttpCookie cookie1 = new HttpCookie("cp1", model.LoginId);
                   HttpCookie cookie2 = new HttpCookie("cp2",Enctry(model.LoginPwd));
                   cookie1.Expires = DateTime.Now.AddDays();
                   cookie2.Expires = DateTime.Now.AddDays();
                   Response.Cookies.Add(cookie1);
                   Response.Cookies.Add(cookie2);
               }
               GoPage(msg);

           }
           else
           {
               Response.Redirect("/ShowMsg.aspx?msg=" + Server.UrlEncode(msg) + "&txt=" + Server.UrlEncode("登录页") + "&url=/Login.aspx");
           }
        }