public ItemGioHang(int iMaSP, int sl) { using (QLBCCEntities2 db = new QLBCCEntities2()) { this.MaSP = iMaSP; SanPham sp = db.SanPham.Single(n => n.MaSP == iMaSP); this.TenSP = sp.TenSP; this.HinhAnh = sp.HinhAnh; this.SoLuong = sl; this.DonGia = sp.DonGia.Value; this.ThanhTien = SoLuong * DonGia; } }