public ActionResult Create(Professor professor)
        {
            if (ModelState.IsValid)
            {
                Repositorio.Incluir(professor);
                return RedirectToAction("Index");
            }

            return View(professor);
        }
 public ActionResult Edit(Professor professor)
 {
     if (ModelState.IsValid)
     {
         Repositorio.Atualizar(professor);
         return RedirectToAction("Index");
     }
     return View(professor);
 }