private void btnThemLop_Click(object sender, EventArgs e)
{
var frm = new frmLop();
if (Application.OpenForms[frm.Name] == null)
{
frm.Show();
}
else
{
Application.OpenForms[frm.Name].Focus();
}
}
private void btnLop_ItemClick(object sender, ItemClickEventArgs e)
{
Form frm = this.KiemTraTonTai(typeof(frmLop));
if (frm != null)
{
frm.Activate();
}
else
{
frmLop f = new frmLop
{
MdiParent = this
};
f.Show();
}
}
