private void quảnLýTiêuĐềToolStripMenuItem_Click(object sender, EventArgs e) { QLTieuDe frmQLTieuDe = new QLTieuDe(); foreach (Form frm in MdiChildren) { frm.Close(); } frmQLTieuDe.MdiParent = this; frmQLTieuDe.Show(); }
private void quảnLýTiêuĐềToolStripMenuItem_Click(object sender, EventArgs e) { QLTieuDe frmQLTieuDe = new QLTieuDe(); hienForm(frmQLTieuDe); }