System.Threading.Barrier.SignalAndWait C# (CSharp) Method

        public void SignalAndWait(CancellationToken cancellationToken)
        {
            #if DEBUG
            bool result =
            #endif
             SignalAndWait(Timeout.Infinite, cancellationToken);
            #if DEBUG
            Debug.Assert(result);
            #endif
        }

        /// <summary>
        /// Download all the images for the current session
        /// </summary>
        public void DownloadAllTreatmentImages()
        {
            Barrier barrier = new Barrier(_patient.PatientTreatment.TrainingList.Count + 2);

            Task treatmentThread = new Task(() =>
            {
                //Downloading all thumbs in treatment
                DownloadTreatment();

                barrier.SignalAndWait();
            });
            treatmentThread.Start();

            foreach(Training t in _patient.PatientTreatment.TrainingList)
            {
                Task tt = new Task(() =>
                {
                    DownloadTraining(_patient.PatientTreatment.TrainingList.IndexOf(t));
                    barrier.SignalAndWait();
                });
                tt.Start();

            }

            barrier.SignalAndWait();
            barrier.Dispose();
        }