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"));
        }