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

        public void Dispose()
        {
            // in case of this is called from the PHA
            if (_actionCallerID != 0 && Environment.CurrentManagedThreadId == _actionCallerID)
            {
                throw new InvalidOperationException(SR.Barrier_InvalidOperation_CalledFromPHA);
            }
            Dispose(true);
            GC.SuppressFinalize(this);
        }

        /// <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();
        }