private void BtnObrisiProlazak_Click(object sender, RoutedEventArgs e) { Prolasci p = dataGrid.SelectedItem as Prolasci; int a = k.obrisiProlazak(p); if (a == 0) { MessageBox.Show("Neuspesno brisanje prolaska!"); return; } else { MessageBox.Show("Uspesno obrisan prolazak!"); } dataGrid.ItemsSource = k.vratiListuProlazaka(); }