private void orderPenjualanToolStripMenuItem1_Click(object sender, EventArgs e) { Form form = Application.OpenForms["FormDaftarOrderPenjualan"]; if (form == null) { FormDaftarOrderPenjualan frm = new FormDaftarOrderPenjualan(); frm.Owner = this; frm.Show(); } else { form.Show(); form.BringToFront(); } }