private void TabloYenilebtn_Click(object sender, EventArgs e)
        {
            MusteriBL musteriGoster = new MusteriBL();

            dt = musteriGoster.Musteri_Tablo();
            dgvMusteriTablo.DataSource = dt;
        }
        private void Satis_Form_Load(object sender, EventArgs e)
        {
            txtSatisTarih.Text = DateTime.Now.ToString();

            UrunBL urunGoster = new UrunBL(); //ürünleri listele

            dt = urunGoster.Urun_Tablo();
            dgvUrunTablo.DataSource = dt;

            MusteriBL musteriGoster = new MusteriBL();//müşteri listele

            dt = musteriGoster.Musteri_Tablo();
            dgvMusteriTablo.DataSource = dt;

            PersonelBL personelGoster = new PersonelBL();//personel listele

            dt = personelGoster.Personel_ad_goster();
            dgvPersonelTablo.DataSource = dt;
        }