public ItemGioHang(int maSP, int soLuong) { using (QuanLyBanHangDBEntities db = new QuanLyBanHangDBEntities()) { SanPham sp = db.SanPhams.Where(n => n.MaSP == maSP).SingleOrDefault(); MaSP = sp.MaSP; TenSP = sp.TenSP; SoLuong = soLuong; DonGia = sp.DonGia.Value; ThanhTien = DonGia * soLuong; HinhAnh = sp.HinhAnh; } }