//Quản lý
private void btnQLGV_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
{
Form frm = kiemtraform(typeof(QLGiaoVien));
if (frm == null)
{
QLGiaoVien forms = new QLGiaoVien();
forms.MdiParent = this;
forms.Show();
}
else
{
frm.Activate();
}
}
private void menuQLGV_Click(object sender, EventArgs e)
{
QLGiaoVien frm = new QLGiaoVien();
frm.Show();
}