private void btnDSLop_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
{
Form frm = kiemtraform(typeof(QLLichHoc));
if (frm == null)
{
QLLichHoc forms = new QLLichHoc();
forms.MdiParent = this;
forms.Show();
}
else
{
frm.Activate();
}
}
private void menuQLLich_Click(object sender, EventArgs e)
{
QLLichHoc frm = new QLLichHoc();
frm.Show();
}