private void submenu_penjualan_Click(object sender, EventArgs e) { if (trx == null) { trx = new FormTransaksi(); trx.MdiParent = this; trx.FormClosed += new FormClosedEventHandler(trnsksi_FormClosed); trx.Show(); } else { trx.Activate(); } }
void trnsksi_FormClosed(Object sender, FormClosedEventArgs e) { trx = null; }