public bool SuaKhachHang(ref string err, int MaKH, string TenKhachHang, string SDT, string DiaChi) { bool f = false; try { dbs.SP_SuaKH(MaKH, TenKhachHang, SDT, DiaChi); f = true; } catch (Exception e) { err = e.Message; } return(f); }