private void frmQuanLyHoaDon_Load(object sender, EventArgs e)
{
dshd.Clear();
lvHD.Items.Clear();
dshd = HDC.danhSachHD();
foreach (ListViewItem hd in dshd)
{
lvHD.Items.Add(hd);
}
tinh_tong_tien_listview();
}
