ASP.NET MVC Errors

Global_Application_Error.asax

// NOTE: ELMAH logs the errors anyway

protected void Application_Error(object sender, EventArgs e)
{
    var exception = Server.GetLastError();
    var httpException = exception as HttpException;

    if (httpException != null)
    {
        switch (httpException.GetHttpCode())
        {
            case 404:
                Response.RedirectToRoute(new { controller = "Error", action = "NotFound", path = Request.Path });
                break;
        }
    }

    if (!Response.IsRequestBeingRedirected)
    {
        Response.RedirectToRoute(new { controller = "Error", action = "Index" });
    }

    // clear the error on server.
    Server.ClearError();

    // avoid IIS7 getting in the middle
    Response.TrySkipIisCustomErrors = true;
}

Web.config1

<modules runAllManagedModulesForAllRequests="true">