private void btnXe_ItemClick(object sender, ItemClickEventArgs e)
{
frmXe f = new frmXe();
f.MdiParent = this;
f.Show();
}
private void mnquanlyxe_Click(object sender, EventArgs e)
{
foreach (Form mdiChild in this.MdiChildren)
{
if (mdiChild.Name == "frmXe")
{
mdiChild.Activate();
return;
}
}
frmXe uc = new frmXe();
uc.Show();
uc.MdiParent = this;
}