public void LoadHangHoa()
        {
            listViewDSHH.Items.Clear();
            dtb = hhbll.LayToanBoThongTinHH();
            var hh = dtb.AsEnumerable()
                     .Select(x => new
            {
                maHang  = x.Field <string>("maHang"),
                tenHang = x.Field <string>("tenHang"),
                tenLoai = x.Field <string>("tenLoai"),
                nSX     = x.Field <DateTime>("nSX"),
                hSD     = x.Field <DateTime>("hSD"),
                soLuong = x.Field <int>("soLuong"),
                gia     = x.Field <int>("gia"),
                tenNSX  = x.Field <string>("tenNSX"),
                viTri   = x.Field <string>("viTri"),
            })
                     .ToList();



            hh.ForEach(x =>
            {
                ListViewItem lt = new ListViewItem(x.maHang);
                lt.SubItems.Add(x.tenHang);
                lt.SubItems.Add(x.tenLoai);
                lt.SubItems.Add(x.nSX + "");
                lt.SubItems.Add(x.hSD + "");
                lt.SubItems.Add(x.soLuong + "");
                lt.SubItems.Add(x.gia + "");
                lt.SubItems.Add(x.tenNSX);
                lt.SubItems.Add(x.viTri);

                listViewDSHH.Items.Add(lt);
            });
        }