// Tokens for cancellation
            ParallelOptions po = new ParallelOptions();
            po.CancellationToken = cts.Token;

            try
            {
                Parallel.ForEach(queries, po, (currentQuery) =>
                {
                    // Execute query
                    ExecuteQuery(currentQuery);

                    // Throw exception if cancelled
                    po.CancellationToken.ThrowIfCancellationRequested(); // ***
                });
            }
            catch (OperationCanceledException cancelException)
            {
                Console.WriteLine(cancelException.Message);
            }

System.OperationCanceledException was unhandled by user code
  Message=The operation was canceled.
  Source=mscorlib
  StackTrace:
   at System.Threading.CancellationToken.ThrowIfCancellationRequested()
   at CraigslistReader.SearchObject.<>c__DisplayClass7.<bw_DoWork>b__5(Query currentQuery) in {PATH}:line 286
   at System.Threading.Tasks.Parallel.<>c__DisplayClass2d`2.<ForEachWorker>b__23(Int32 i)
   at System.Threading.Tasks.Parallel.<>c__DisplayClassf`1.<ForWorker>b__c()
InnerException: