private void buttongiris_Click(object sender, EventArgs e) { Veritabani.Connect(); k1.USERNAME = textBoxad.Text; k1.SIFRE = textBoxsifre.Text; lk1 = Veritabani.KULLANICI_GETIR(k1); if (lk1.Count > 0 && textBoxad.Text != "" && textBoxad.Text != "") { ana.Show(); this.Hide(); } Veritabani.Disconnect(); }