private void Btn_Click(object sender, EventArgs e)
{
frm_ChiTietHang form_ChiTietHang = new frm_ChiTietHang();
form_ChiTietHang.maHang = Convert.ToInt32((sender as Button).Tag);
form_ChiTietHang.ShowDialog();
}
private void BtnXemChiTiet_Click(object sender, EventArgs e)
{
Button btnXem = sender as Button;
Hang hang=(Hang)listhang[btnXem.Tag];
frm_ChiTietHang formChiTietHang = new frm_ChiTietHang();
formChiTietHang.hang = hang;
formChiTietHang.ShowDialog();
}