c#cookie读取写入操作

public static void setcookie(string cname, string value, int effective)
        {
            httpcookie cookie = new httpcookie(cname);
            cookie.value = value;
            cookie.expires = datetime.now.adddays(effective);
            httpcontext.current.response.cookies.add(cookie);
        }

        public static object getcookie(string cname)
        {
            httpcookie cookie = httpcontext.current.request.cookies[cname];
            return cookie;
        }

        public static void removecookie(string name)
        {
            httpcookie cookie = httpcontext.current.request.cookies[name];
            if (cookie != null)
            {
                cookie.expires = datetime.now.adddays(-10);
                httpcontext.current.response.cookies.add(cookie);
            }
        }