public static void ClearCookie()

        {

            try

            {

                HttpCookie userCookie = new HttpCookie("zzm");

                userCookie.Expires = new System.DateTime(1999, 10, 12);

                string domain = System.Configuration.ConfigurationManager.AppSettings["EJJJCookieDomainName"].ToString();

                if (!string.IsNullOrEmpty(domain))

                {

                    userCookie.Domain = domain;

                }

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

                HttpContext.Current.Session.Clear();

                HttpContext.Current.Session.Abandon();

            }

            catch (Exception e)

            {

                //ExceptionService.Current.Handle(e);

            }

        }