//xoa public static bool XoaNhomHang(string ma) { return(DL_NhomHang.NhomHangXoa(ma)); }
//them nhom hang public static bool ThemNhomHang(string ma, string ten) { return(DL_NhomHang.NhomHangThem(ma, ten)); }
//sua nhom hang public static bool SuaNhomHang(string ma, string ten) { return(DL_NhomHang.NhomHangSua(ma, ten)); }
//lay data kho public static DataTable LayDuLieunNhomHang() { return(DL_NhomHang.DuLieuKhoHang()); }