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(10);//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");
            }
        }