Before.cs

public ActionResult Edit()
{
    var conferenceName = Request["ConferenceName"] as string;
    var repository = new ConferenceRepository();
    var conference = repository.GetByName(conferenceName);

    if (conference == null)
        return View("ConferenceNotFound");

    ViewData["ConferenceId"] = conference.Id,
    ViewData["ConferenceName"] = conference.Name

    return View();
}

public ActionResult Save()
{
    var conferenceName = Request["ConferenceName"] as string
    if (string.IsNullOrEmpty(conferenceName))
    {
        ViewBag.ErrorMessage = "Conference Name is required";
        return View("Edit");
    }

    var repository = new ConferenceRepository();
    var conference = repository.GetById(new Guid(Request["ConferenceId"] as string));
    conference.ChangeName(Request["ConferenceName"] as string);
    _repository.Save(conference);

    return RedirectToRoute("Default", new { action = "Index"});
}