After.cs

[HttpGet]
public ActionResult Edit(Conference conference)
{
    return AutoMapView<ConferenceEditModel>(View(conference));
}

[HttpPost]
public ActionResult Edit(ConferenceEditModel form)
{
    if (!ViewData.ModelState.IsValid)
        return View(form);

    var conference = _repository.GetById(form.Id);
    conference.ChangeName(form.Name);

    return this.RedirectToAction<DefaultController>(c => c.Index());
}