public int insert_cthd(string MaHD, string MaHang, int SL) { return(cthddal.CTHD_insert(MaHD, MaHang, SL)); }
public int CTHD_insert(string MaHD, string MaLoaiHang, int SL) { return(cthddav.CTHD_insert(MaHD, MaLoaiHang, SL)); }