public GioHang(int MaSP)
{
using (QLBanHangDienThoaiEntities db = new QLBanHangDienThoaiEntities())
{
this.MaSP = MaSP;
SanPham sp = db.SanPhams.Single(n => n.MaSP == MaSP);
TenSP = sp.TenSP;
DonGia = sp.DonGia.Value;
ThanhTien = DonGia * SoLuong;
}
}
