private void PollingTimerEllapsed(object sender, ElapsedEventArgs e)
        {
            try
            {
                if (_isPollingCancelled)
                {
                    _pointsToPoll = null;
                }
                else
                {
                    _pointsToPoll.Read();

                    ReadCount++;
                }
            }
            catch (Exception ex)
            {
                AddLogEntry(ex.Message);

                ErrorCount++;
            }
            finally
            {
                if (!_isPollingCancelled && _pointsToPoll != null)
                {
                    _pollingTimer.Start();
                }
            }
        }