                  null;
                            }
                            else {
                                tb.contents = { Tag: 0.000000 };
                                null;
                            };
                        }
                        else {
                            if (qb.MoveNext()) {
                                tb.contents = { Tag: 1.000000, Value: E(qb.get_Current()) };
                                null;
                            }
                      