cookie not updated

[George]

I put following code in the application_beginRequest event handler to
capture the user nevigation information and put it in the cookie. First
time, it will add it ot cookie then it never update the cookie event I can
see it execute the code correctlly. It will only update the cookie when I do
refresh the browser or open a new browser. Any insight?
Thanks
George

HttpCookie cookie = new HttpCookie("url", Request.Url.AbsoluteUri);

cookie.Expires = DateTime.Now.AddDays(10); ;

Response.AppendCookie(cookie);