C# - Retrieve Cookie Values In ASHX?

It's there a way to retreive cookie value in ASHX Handler ?

I set a cookie in a page, and i want to reteive it in my ashx. My cookie is always null.

I save my cookie like this

HttpCookie tokenCookie = new HttpCookie(cookieName);
tokenCookie.Values["siteGuid"] = authenticationInfo.SiteGuid.ToString();
HttpContext.Current.Response.Cookies.Add(tokenCookie);

I retreive my cookie like this

HttpCookie cookie = HttpContext.Current.Request.Cookies[cookieName];
return new Guid(cookie["siteGuid"]);

Ok sorry that was my fault. My handler was on a sub domaine.