public async Task <IHttpActionResult> PutSong(int id, Song song) { if (!ModelState.IsValid) { return(BadRequest(ModelState)); } if (id != song.Id) { return(BadRequest()); } dbRepository.ChangeState(song); try { await dbRepository.SaveChangesAsync(); } catch (DbUpdateConcurrencyException) { if (!SongExists(id)) { return(NotFound()); } else { throw; } } return(StatusCode(HttpStatusCode.NoContent)); }