public async Task<ActionResult> Edit(Album album)
 {
     if (ModelState.IsValid)
     {
         db.Entry(album).State = EntityState.Modified;
         await db.SaveChangesAsync();
         return RedirectToAction("Index");
     }
     ViewBag.ArtistId = new SelectList(db.Artists, "ArtistId", "Name", album.ArtistId);
     ViewBag.GenreId = new SelectList(db.Genres, "GenreId", "Name", album.GenreId);
     return View(album);
 }
        public async Task<ActionResult> Create(Album album)
        {
            if (ModelState.IsValid)
            {
                db.Albums.Add(album);
                await db.SaveChangesAsync();
                return RedirectToAction("Index");
            }

            ViewBag.ArtistId = new SelectList(db.Artists, "ArtistId", "Name", album.ArtistId);
            ViewBag.GenreId = new SelectList(db.Genres, "GenreId", "Name", album.GenreId);
            return View(album);
        }