<httpErrors errorMode="Custom" existingResponse="Replace">
      <clear/>
      <error statusCode="500" path="/ErrorPage/ErrorMessage/500" responseMode="ExecuteURL" />
      <error statusCode="404" path="/ErrorPage/ErrorMessage/404" responseMode="ExecuteURL" />
</httpErrors>

routes.MapRoute(
                "ErrorPage", // route name
                "ErrorPage/{action}/{id}", // url with parameters
                new { controller = "errorpage", action = "main", id = UrlParameter.Optional }
                );

[MultiLanguageAction]
    public class ErrorPageController : Controller
    {
        // GET: /ErrorPage/

        public ActionResult Main()
        {     return ErrorMessage();     }

        public ActionResult ErrorMessage(string lang = "", int id = 200)
        {
            Response.StatusCode = id;
            return View(new ErrorPageModel(Request, lang) { ErrorNr = id });
        }
    }