private void m_penjualan_Click(object sender, EventArgs e) { if (jual == null) { jual = new Penjualan(); jual.MdiParent = this; jual.FormClosed += new FormClosedEventHandler(Jual_FormClosed); jual.Show(); } else { jual.Activate(); } }
private void Jual_FormClosed(object sender, FormClosedEventArgs e) { jual = null; }