private void lớpHọcToolStripMenuItem_Click(object sender, EventArgs e) { if (Kiemtraform("frmTimcobanLH") == false) { frmTimLH frmTimlh = new frmTimLH(); frmTimlh.Name = "frmTimcobanLH"; frmTimlh.MdiParent = this; frmTimlh.Show(); } }
private void btnTimLH_Click(object sender, EventArgs e) { frmTimLH lophoc = new frmTimLH(); lophoc.ShowDialog(); }