Remove cookie by expiring it not working

Question

I have a cookie that I add to the response, but if a cookie with the same key already exists I want to remove it otherwise I end up with 2 cookies of the same key.

I thought by simply expiring the cookie it would remove it from the browser?

HttpCookie cookie = new HttpCookie("UserCookie");
cookie.Value = encTicket;

if (HttpContext.Current.Request.Cookies["UserCookie"] != null)
    ClearCookie("UserCookie");

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


private static void ClearCookie(string key)
{
    var httpContext = new HttpContextWrapper(HttpContext.Current);
    var _response = httpContext.Response;

    HttpCookie cookie = new HttpCookie(key)
    {
        Expires = DateTime.Now.AddMonths(-1),
        Value = null
    };

    _response.Cookies.Add(cookie);
}

Any help much appreciated.

Answer 1

For now I'm just selecting the last cookie value in the collection, although I realise this is a massive hack. Any better suggestions very welcome.

string value = "";
for (int i = 0; i < HttpContext.Current.Request.Cookies.Count; i++)
{
    if (HttpContext.Current.Request.Cookies[i].Name == "UserCookie")
    value = HttpContext.Current.Request.Cookies[i].Value;
}