private void btnSua_Click(object sender, EventArgs e)
{
themOrSua = 0;
FormHangHoa frm = new FormHangHoa(themOrSua, hh);
frm.ShowDialog();
loadData();
}
private void btnThemHangHoa_Click(object sender, EventArgs e)
{
FormHangHoa hh = new FormHangHoa();
hh.Show();
}
