public ActionResult Edit(Play play)
 {
     if (ModelState.IsValid)
     {
         db.Entry(play).State = EntityState.Modified;
         db.SaveChanges();
         return RedirectToAction("Index");
     }
     ViewBag.AuthorId = new SelectList(db.Authors, "Id", "Name", play.AuthorId);
     ViewBag.GenreId = new SelectList(db.Genres, "Id", "Name", play.GenreId);
     return View(play);
 }
        public ActionResult Create(Play play)
        {
            if (ModelState.IsValid)
            {
                db.Plays.Add(play);
                db.SaveChanges();
                return RedirectToAction("Index");
            }

            ViewBag.AuthorId = new SelectList(db.Authors, "Id", "Name", play.AuthorId);
            ViewBag.GenreId = new SelectList(db.Genres, "Id", "Name", play.GenreId);
            return View(play);
        }