private void DatTruoc(object sender, EventArgs e) { bool check = CheckExistForm("frmQuanlydia"); if (!check) { frmDatTruoc f = new frmDatTruoc(); f.MdiParent = this; f.Show(); } else { ActiveChildForm("frmQuanlydia"); } }
private void DatTruoc(object sender, EventArgs e) { frmDatTruoc f = new frmDatTruoc(); f.ShowDialog(); }