public ActionResult BolumSil(int id) { List <dbTez> dbTezs = tezManager.GetAll(); foreach (var item in dbTezs) { if (item.Bolum.Id == id) { tezManager.Delete(item); } } List <dbDanisman> dbDanisman = danismanManager.GetAll(); foreach (var item in dbDanisman) { if (item.DanismanBolumu.Id == id) { danismanManager.Delete(danismanManager.Get(id)); } } bolumManager.Delete(bolumManager.Get(id)); return(RedirectToAction("Bolumler", "Admin")); }