private void đặtTrướcToolStripMenuItem1_Click(object sender, EventArgs e) { DatTruoc frmQLDT = new DatTruoc(); foreach (Form frm in MdiChildren) { frm.Close(); } frmQLDT.MdiParent = this; frmQLDT.Show(); }
private void đặtTrướcToolStripMenuItem1_Click(object sender, EventArgs e) { DatTruoc frmQLDT = new DatTruoc(); hienForm(frmQLDT); }