private void buttonPrijava_Click(object sender, EventArgs e) { ServiceReferenceSZ.StrelskaZvezaClient client = new ServiceReferenceSZ.StrelskaZvezaClient(); ServiceReferenceSZ.User u = new ServiceReferenceSZ.User { Ime = textBox1.Text, Geslo = textBox2.Text }; if (client.CheckUser(u, out bool admin)) { MainWindow mw = new MainWindow(); this.Hide(); mw.Show(); } else { MessageBox.Show("napacno geslo"); } }