private void AddCustomer()
{
musteriBusiness = new MusteriBusiness();
musteri = new Musteri();
musteri.Ad = txtMAd.Text;
musteri.Soyad = txtMSoyad.Text;
musteri.TelNo = masktxtTel.Text;
musteri.MusteriTurId = int.Parse(cmboxMTur.SelectedValue.ToString());
musteriBusiness.AddCustomer(musteri);
}