private void CalisanEkle_Load(object sender, EventArgs e)
        {
            FirmalarRepository b = new FirmalarRepository();

            firmalar = b.TumVeriyiGetir();
            for (int i = 0; i < firmalar.Count; i++)
            {
                cmb_FirmaId.Items.Add(firmalar[i].FirmaAdi);
            }
        }
        private void YoneticiAracKiralama_Load(object sender, EventArgs e)
        {
            araclar = arac.KiralanmayanlariGetir();
            dt_AracListele.DataSource = araclar;
            FirmalarRepository b = new FirmalarRepository();

            firmalar = b.TumVeriyiGetir();
            for (int i = 0; i < firmalar.Count; i++)
            {
                cmb_FirmaSec.Items.Add(firmalar[i].FirmaAdi);
            }
            MusterilerRepository a = new MusterilerRepository();

            musteriler = a.TumVeriyiGetir();
            for (int i = 0; i < musteriler.Count; i++)
            {
                cmb_MusSec.Items.Add(musteriler[i].MusteriAd);
            }
        }