private void button2_Click(object sender, EventArgs e)
        {
            string hasil, resolusi;
            resolusi = cmbResolusi.SelectedItem.ToString();

            tampil tampilan = new tampil();
            hasil = tampilan.tampilMonitor(resolusi);
            textTampil.Text = hasil;
            cmbUkuran.Enabled = false;
            textJumlah.ReadOnly = true;
        }