private void detach_ChiTietDonHangs(ChiTietDonHang entity)
 {
     this.SendPropertyChanging();
     entity.SanPham = null;
 }
 partial void DeleteChiTietDonHang(ChiTietDonHang instance);
 partial void InsertChiTietDonHang(ChiTietDonHang instance);
 partial void UpdateChiTietDonHang(ChiTietDonHang instance);
 private void attach_ChiTietDonHangs(ChiTietDonHang entity)
 {
     this.SendPropertyChanging();
     entity.DonHang = this;
 }