Null Values in OnUpdate

[engcoder]

Dears,
i try all possible values of IsSnapshotAvailable and _listener.Update
1- true - true
2- false - false
3- true - false
4- false - true

the 1&2 cases not return null and also not return the snapshot.
the 3&4 cases return null on first update from lightstreamer.

what i need is to get the snapshot data on first update

Regards