private void barButtonItem6_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
{
Form frm = kiemtraform(typeof(Frm_khachhang));
if (frm == null)
{
Frm_khachhang forms = new Frm_khachhang();
forms.MdiParent = this;
forms.Show();
}
else
{
frm.Activate();
}
}
private void button1_Click(object sender, EventArgs e)
{
Frm_khachhang forms = new Frm_khachhang();
forms.Show();
}
