Asp.NET MVC Hata Sayfası Yönlendirme

public class ErrorController : Controller
    {
        // GET: Error
        public ActionResult PageError(Exception exception)
        {
            Response.TrySkipIisCustomErrors = true;
            return View();
        }
        public ActionResult Page404()
        {
            Response.StatusCode = 404;
            Response.TrySkipIisCustomErrors = true;
            return View();
        }
        public ActionResult Page403()
        {
            Response.StatusCode = 403;
            Response.TrySkipIisCustomErrors = true;
            return View();
        }
    }

<system.webServer>
    <handlers>
      <remove name="BlockViewHandler"/>
      <add name="BlockViewHandler" path="*" verb="*" preCondition="integratedMode" type="System.Web.HttpNotFoundHandler" />
    </handlers>

    <httpErrors errorMode="Custom" existingResponse="Replace">
      <remove statusCode="404" subStatusCode="-1"/>
      <error statusCode="404" path="Error/Page404" responseMode="ExecuteURL"/>
      <remove statusCode="403" subStatusCode="-1"/>
      <error statusCode="403" path="Error/Page403" responseMode="ExecuteURL"/>
    </httpErrors>
  </system.webServer>

<system.web>
    <customErrors mode="RemoteOnly" defaultRedirect="Error">
      <error statusCode="404" redirect="Page404"/>
      <error statusCode="403" redirect="Page403"/>
    </customErrors>
</system.web>

protected void Application_EndRequest()
        {
            if (Context.Response.StatusCode == 404)
            {
                Response.Clear();

                var rd = new RouteData();
                rd.Values["controller"] = "Error";
                rd.Values["action"] = "Page404";

                IController c = new ErrorController();
                c.Execute(new RequestContext(new HttpContextWrapper(Context), rd));
            }
            else if (Context.Response.StatusCode == 403)
            {
                Response.Clear();

                var rd = new RouteData();
                rd.Values["controller"] = "Error";
                rd.Values["action"] = "Page403";

                IController c = new ErrorController();
                c.Execute(new RequestContext(new HttpContextWrapper(Context), rd));
            }
        }