private void barbtnMH_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
{
QuanLyMonHoc mh = new QuanLyMonHoc();
if (Application.OpenForms[mh.Name] == null)
{
mh.MdiParent = this;
mh.Show();
}
else
{
Application.OpenForms[mh.Name].Focus();
}
}
private void BtnQuanLyMon_Click(object sender, EventArgs e)
{
Form frm = new QuanLyMonHoc();
frm.Show();
}