public bool ThemTangQua(ref string err, int MaDonHang, string MaHang, string MaQua, int SoLuong) { bool f = false; try { dbs.SP_ThemTangQua(MaDonHang, MaHang, MaQua, SoLuong); f = true; } catch (Exception e) { err = e.Message; } return(f); }