Proper way to use C# Tasks?

        private void fnRun_Queue(BlockingCollection<Fake_PC> processing_list,
                                 BlockingCollection<Fake_PC> fake_pc_results,
                                 BlockingCollection<Fake_PC> pc_error_list,
                                 Task_Stats my_stats,
                                 int number_of_threads,
                                 int iteration_count)
        {
            ConcurrentQueue<Fake_PC> fake_pc_queue = new ConcurrentQueue<Fake_PC>();
            int total_machines = processing_list.Count;
            int queue_count = 0;
            int results_count = 0;
            int error_count = 0;
            Task[] taskArray = null;
            string duration = null;

            DateTime start_time = DateTime.Now;

            fnUpdate_Status(string.Format("Starting iteration: {0} Records: {1}", iteration_count, processing_list.Count));
            Thread.Sleep(3000);

            foreach (Fake_PC my_pc in processing_list)
            {
                fake_pc_queue.Enqueue(my_pc);
            }

            Boolean execution_flag = true;

            int counter = 1;


            while (execution_flag == true)
            {

                // Task my_task = Task.Factory.StartNew(() => fnGet_Record_count());

                if (queue_count > 0)
                {
                    taskArray = new Task[number_of_threads];

                    for (int i = 0; i < number_of_threads; i++)
                    {

                            if (taskArray[i] == null || taskArray[i].Status == TaskStatus.RanToCompletion)
                            {
                                taskArray[i] = Task.Factory.StartNew(() => { return fnCreate3(fake_pc_queue, fake_pc_results, pc_error_list); });
                            }

                    }


                }
                else
                {
                    fnUpdate_Status("Waiting on threads to finish.");
                    Thread.Sleep(2000);
                }

                Task.WaitAny(taskArray);

            while (fake_pc_queue.IsEmpty == false)
            {
                Fake_PC my_pc;

                if (fake_pc_queue.TryDequeue(out my_pc))
                {
                    pc_error_list.Add(my_pc);
                }
            }

            fnUpdate_Task_Status("");
        }

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