private void CheckForCancel(IProgressCallback progressCallback)
        {
            if (progressCallback == null)
            {
                return;
            }

            if (progressCallback.IsCancelRequested)
            {
                progressCallback.AcceptCancel();
                throw new OperationCanceledException();
            }
        }
        private void CheckForCancel(IProgressCallback progressCallback)
        {
            if (progressCallback == null)
            {
                return;
            }

            if (progressCallback.IsCancelRequested)
            {
                progressCallback.AcceptCancel();
                throw new OperationCanceledException();
            }
        }