C#寫入登陸Cookies

protected void Page_Load(object sender, EventArgs e)        {            //開啟登入頁面時擷取用戶端cookie值並寫入前台控制項中            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 (登入成功)            {                Response.Write("登陸成功");                HttpCookie cookie=new HttpCookie("name",username);//擷取使用者的使用者名稱                cookie.Expires = DateTime.Now.AddDays(10);//設定cookie到期時間為10天后                Response.Cookies.Add(cookie);//將cookie寫入用戶端            }            else            {                Response.Write("登陸失敗");            }        }