// Customizing my own error message // Error message alerts user when invalid organizer ID is entered in the URL public ViewResult Details(int?id) { // Customizing Error Message Organizer organizer = _organizerRepository.GetOrganizer(id.Value); if (organizer == null) { Response.StatusCode = 404; return(View("OrganizerNotFound", id.Value)); } OrganizerRepository organizerDetail = new OrganizerRepository() { Organizer = _organizerRepository.GetOrganizer(id ?? 1), PageTitle = "Organizer Detail" }; return(View(organizerDetail)); }