public ItemGioHang(int IdSanPham, int SL) { using (BanQuanAoEntities2 db = new BanQuanAoEntities2()) { this.IdSanPham = IdSanPham; SanPham sanpham = db.SanPhams.Single(n => n.IdSanPham == IdSanPham); this.TenSanPham = sanpham.TenSanPham; this.HinhAnh = sanpham.HinhAnh; this.DonGia = sanpham.DonGia.Value; this.SoLuong = SL; this.TongTien = DonGia * SoLuong; } }