C#写入登陆Cookies

 protected void Page_Load(object sender, EventArgs e)
         {
             //打开登录页面时获取客户端cookie值并写入前台控件中
             HttpCookie cookie = Request.Cookies["name"];
             if (cookie == null)
             {
                 UserName.Text = "";

             }
             else
             {
                 UserName.Text = cookie.Value;
             }
         }

         protected void btnSubmit_Click(object sender, EventArgs e)
         {
             string username = Request.QueryString["UserName"];
             string password = Request.QueryString["PassWord"];
             if (登录成功)
             {
                 Response.Write("登陆成功");
                 HttpCookie cookie=new HttpCookie("name",username);//获取用户的用户名
                 cookie.Expires = DateTime.Now.AddDays();//设置cookie过期时间为10天后
                 Response.Cookies.Add(cookie);//将cookie写入客户端
             }
             else
             {
                 Response.Write("登陆失败");
             }
         }