route CFG

routes.MapRoute(
                name: "Default",
                url: "{controller}/{action}/{id}",
                defaults: new { controller = "Abcde", action = "Index", id = UrlParameter.Optional }
            );

Controller Action

        public ActionResult RisExport(int id, string folderId, bool publicExport)
        {
            bool checkBeschlussExists = false;

            XDocument risdata = CreateDataXml(id);

            try
            {
                ...
                checkBeschlussExists = (bool)cmd.ExecuteScalar();

            }


            if (checkBeschlussExists)
            {
                ....
            }

            //return RedirectToAction("Index", "Abcde");
            return RedirectToRoute("Default", new { Controller = "Abcde", Action = "Index" });
        }