public ActionResult Sign(FormCollection c) { Guest newGuest = new Guest(); TryUpdateModel(newGuest); if (ModelState.IsValid) { GuestBook book = new GuestBook(); try { book.AddGuest(newGuest); } catch (ArgumentException e) { ModelState.AddModelError("", e.Message); return(View()); } return(RedirectToAction("index", "home")); } return(View()); }