public ItemGioHang(int id_sp, int sl)
{
using (DuAnCuoiKhoaEntities db = new DuAnCuoiKhoaEntities())
{
this.ID_SanPham = id_sp;
SanPham sp = db.SanPhams.Single(x => x.ID_SanPham == id_sp);
this.TenSanPham = sp.TenSanPham;
this.HinhAnh = sp.Avatar;
this.DonGia = sp.GiaGoc.Value;
this.SoLuong = sl;
this.ThanhTien = DonGia * SoLuong;
}
}