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thanks for reply but i try that and result is null or no data on the onupdate()
i will illustrate my case it may differ and give you example of what happened.
my adapter sends the updates to the...

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...