public XuatHang_DTO(DataRow dr)
 {
     KhachHang   = new KhachHang_DTO(dr);
     LoaiSanPham = new LoaiSanPham_DTO(dr);
     NhanVien    = new NhanVien_DTO(dr);
     NhaSanXuat  = new NhaSanXuat_DTO(dr);
     Ma_CTPX     = (int)dr["Ma_CTPX"];
     Ma_PX       = (int)dr["Ma_PX"];
     Ma_Sanpham  = (int)dr["Ma_Sanpham"];
     SoLuong     = (int)dr["SoLuong"];
     DonGia      = Convert.ToDecimal(dr["DonGia"]);
     TenSanPham  = (string)dr["TenSanPham"];
     TenKH       = KhachHang.Ten_KH;
     TenNV       = NhanVien.Ten_NV;
 }
 public XuatHang_DTO()
 {
     KhachHang   = new KhachHang_DTO();
     LoaiSanPham = new LoaiSanPham_DTO();
     NhanVien    = new NhanVien_DTO();
     NhaSanXuat  = new NhaSanXuat_DTO();
     Ma_CTPX     = 0;
     Ma_PX       = null;
     Ma_Sanpham  = null;
     TenSanPham  = "";
     SoLuong     = null;
     DonGia      = null;
     TenKH       = "";
     TenNV       = "";
 }