移除cookies的子項

HttpCookie cookie = HttpContext.Current.Request.Cookies["aaa"];
            if (cookie != null)
            {//移除cookies的子項
                cookie.Values.Remove(cookiesName);
                HttpContext.Current.Response.AppendCookie(cookie);
                //HttpContext.Current.Response.SetCookie(cookie);//不是這句代碼                
            }