protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                txtMaHang.Attributes.Add("data-field", "MaHieuMatHang");
                txtMaHangTheoDon.Attributes.Add("data-field", "MaHangTheoDon");
                txtDonViTinh.Attributes.Add("data-field", "DonViTinh");
                txtTenHang.Attributes.Add("data-field", "TenMatHang");
                txtSoLuong.Attributes.Add("data-field", "SoLuong");
                txtChieuDai.Attributes.Add("data-field", "ChieuDai");
                txtChieuRong.Attributes.Add("data-field", "ChieuRong");
                txtChieuCao.Attributes.Add("data-field", "ChieuCao");
                txtTai.Attributes.Add("data-field", "Tai");
                txtLe.Attributes.Add("data-field", "Le");
                dropLoaiKichThuoc.Attributes.Add("data-field", "LoaiKichThuoc");
                dropLoaiThung.Attributes.Add("data-field", "TenLoaiSanPham");
                txtSoLuongMau.Attributes.Add("data-field", "SoLuongMau");
                txtMauSacMatNgoai.Attributes.Add("data-field", "MauSacMatNgoai");
                txtSoLop.Attributes.Add("data-field", "SoLop");
                //DropLoaiGiay.Attributes.Add("data-field", "LoaiGiay");
                txtKhoGiay.Attributes.Add("data-field", "KhoGiay");
                txtDinhLuong.Attributes.Add("data-field", "DinhLuong");
                txtDienTichSanPham.Attributes.Add("data-field", "DienTichSanXuat");
                dropCongDoanKetThuc.Attributes.Add("data-field", "CongDoanCuoi");
                txtDonGia.Attributes.Add("data-field", "DonGia");
                txtThanhTien.Attributes.Add("data-field", "ThanhTien");
                txtGhiChu.Attributes.Add("data-field", "GhiChu");
                dropLoaiKichThuoc.DataSource     = dts.Sp_Qldh_LoaiKichThuoc_Select(0, (int?)null, 0, 1, "");
                dropLoaiKichThuoc.DataTextField  = "LoaiKichThuoc";
                dropLoaiKichThuoc.DataValueField = "ID";
                dropLoaiKichThuoc.DataBind();

                dropLoaiThung.DataSource     = dts.Sp_Qldh_LoaiSanPham_Select(0, (int?)null, 0, 1, "");
                dropLoaiThung.DataTextField  = "TenLoaiSanPham";
                dropLoaiThung.DataValueField = "ID";
                dropLoaiThung.DataBind();
                cblLoaiSong.DataSource     = dts.Sp_Qldh_DanhMucSong_Select(0, (int?)null, 0, 1, "");
                cblLoaiSong.DataTextField  = "TenSong";
                cblLoaiSong.DataValueField = "ID";
                cblLoaiSong.DataBind();

                dropCongDoanKetThuc.DataSource     = dts.Sp_Qlsx_CongDoan_Select(0, (int?)null, 0, null, "");
                dropCongDoanKetThuc.DataTextField  = "TenCongDoan";
                dropCongDoanKetThuc.DataValueField = "ID";
                dropCongDoanKetThuc.DataBind();
            }

            if (Attributes["param"] != null)
            {
                string URL = Attributes["param"];
                ID_HangHoa = Util.GetParam(URL, "id");
            }
        }