如何在ASP.NET中分配非持久性(内存中)cookie？

HttpCookie cookie = new HttpCookie("cookieName");
cookie.Value = "cookieValue";

cookie.Expires = DateTime.Now.AddDays(-1);

HttpContext.Current.Response.Cookies.Add(cookie);

protected void Page_Load(object sender, EventArgs e)
{
    HttpCookie cookie = new HttpCookie("cookieName");
    cookie.Value = "cookieValue";
    cookie.Expires = DateTime.Now.AddDays(-1);
    HttpContext.Current.Response.Cookies.Add(cookie);
}