string ru = System.Configuration.ConfigurationManager.AppSettings["SinglePassport_login"];

            UserPassport userPassport = new UserPassport();
            if (filterContext.HttpContext.Request["uname"] != null && filterContext.HttpContext.Request["key"] != null)
            {
                string username = filterContext.HttpContext.Request["uname"];
                string key = filterContext.HttpContext.Request["key"];
                userPassport.LoginInSingleSignOn(username, key);

            }
            else if (!userPassport.IsLogin())
            {
                if (ru.IndexOf('?') == -1)
                {
                    ru += "?ru=" + filterContext.HttpContext.Request.Url;
                }
                else
                {
                    ru += "ru=" + filterContext.HttpContext.Request.Url; ;
                }
                filterContext.HttpContext.Response.Redirect(ru);
            }