https://learn.microsoft.com/en-us/dotnet/api/system.threading.tasks.dataflow.executiondataflowblockoptions.maxdegreeofparallelism?view=dotnet-uwp-10.0&redirectedfrom=MSDN
ExecutionDataflowBlockOptions.MaxDegreeOfParallelism Property (System.Threading.Tasks.Dataflow) |...
Gets the maximum number of messages that may be processed by the block concurrently.
property systemthreadingtasksdataflow