private void khoToolStripMenuItem_Click(object sender, EventArgs e) { frmKho frm = new frmKho(); this.Hide(); frm.Show(); }
private void btnKho_ItemClick(object sender, ItemClickEventArgs e) { if (KiemTraTonTai("frmKho") == null) { foreach (Form frm1 in MdiChildren) { frm1.Close(); } frmKho frm = new frmKho(); frm.MdiParent = this; frm.Show(); } }