private void TaoMoi(object sender, EventArgs e)
{
frmBanHang banHang = new frmBanHang();
banHang.ShowDialog();
banHang.MdiParent = this.ParentForm.ParentForm.ParentForm;
}
private void btnBanHang_ItemClick(object sender, ItemClickEventArgs e)
{
frmBanHang frm = new frmBanHang();
frm.ShowDialog();
}
