private void cmbUrunSec_SelectedIndexChanged(object sender, EventArgs e)
 {
     secilenStok = cmbStokSec.SelectedItem as Stoklar;
 }
 private void cmbStoklarSiparis_SelectedIndexChanged(object sender, EventArgs e)
 {
     seciliStok = cmbStoklarSiparis.SelectedItem as Stoklar;
 }