private void simpleButton2_Click(object sender, EventArgs e)
 {
     musteri.MusteriTC = txt_musteritc.Text;
     try
     {
         musteriislem.MusteriSil(musteri);
         MessageBox.Show("Müşteri Başarı İle Silindi", "Bilgi", MessageBoxButtons.OK, MessageBoxIcon.Information);
     }
     catch (Exception ex)
     {
         MessageBox.Show(ex.Message);
     }
 }
 public void MusteriSil(Musteriler musteri)
 {
     musteriislem.MusteriSil(musteri);
 }