清除Cookie,登出操作

 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);
            }
        }