Return the record number and data from the available record closest
to the head of the queue, and delete the record.
(in libdb_dotnet52.dll) Version: 18.104.22.168
- Type: System..::.Boolean
If true and the Queue database is empty, the thread of control will
wait until there is data in the queue before returning.
A KeyValuePair<(Of <(TKey, TValue>)>)
parameter is the record number and whose Value parameter is the