How to customize errors using ASP.NET MVC

1. Add an ErrorController to your application, and add some methods if you need. For example methods are:

public class ErrorController : Controller
{
    [HttpGet]
    [Route("error")]
    public ActionResult Index()
    {
        ViewBag.ErrorMessage = "Something goes wrong";
        return View("Error");
    }

    [HttpGet]
    [Route("error/NotFound")]
    public ActionResult NotFound()
    {
        ViewBag.ErrorMessage = "Nothing found here";
        return View("Error");
    }

    [HttpGet]
    [Route("error/Forbidden")]
    public ActionResult Forbidden()
    {
        ViewBag.ErrorMessage = "Access is denied";
        return View("Error");
    }
}

1. Open your web.config file and make some changes: to <system.web> section xml <system.web> <customErrors mode="On" > <error statusCode="404" redirect="cborder/Error/NotFound"/> <error statusCode ="403" redirect="cborder/Error/Forbidden"/> </customErrors> </system.web> and some changes in <system.webServer> : xml <system.webServer> <httpErrors errorMode="Custom"> <remove statusCode="403"/> <error statusCode="403" path="/error/forbidden" responseMode="Redirect"/> </httpErrors> </system.webServer>