private async void btnLogin_Click(object sender, EventArgs e) { btnLogin.Enabled = false; lblProvera.Text = ""; var korisnik = await proxy.PrijavaAsync(txtUsername.Text, txtPassword.Text); if (korisnik != null && korisnik.Status == Status.admin) { Form2 f = new Form2(korisnik); this.Hide(); f.ShowDialog(); this.Close(); } else { lblProvera.Text = "Pogresan username ili sifra"; } btnLogin.Enabled = true; }