protected void Page_Load(object sender, EventArgs e)
        {
            HttpCookie cookie1 = Request.Cookies["username"];
            HttpCookie cookie2 = Request.Cookies["password"];
            if (cookie1 != null && cookie2!=null)
            {
                Response.Write(cookie1.Value + "<br/>");
                Response.Write(cookie2.Value + "<br/>");
            }
        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            HttpCookie cookie1 = new HttpCookie("username", Guid.NewGuid().ToString());
            cookie1.Expires = DateTime.Now.AddMinutes(1);
            Response.SetCookie(cookie1);

            HttpCookie cookie2 = new HttpCookie("password", Guid.NewGuid().ToString());
            cookie2.Expires = DateTime.Now.AddMinutes(1);
            Response.SetCookie(cookie2);
        }