BogheApp.SessionWindow.timerCall_Elapsed C# (CSharp) Method

        private void timerCall_Elapsed(object sender, ElapsedEventArgs e)
        {
            try
            {
                if (this.Dispatcher.Thread != System.Threading.Thread.CurrentThread)
                {
                    this.Dispatcher.BeginInvoke(System.Windows.Threading.DispatcherPriority.Normal,
                            new EventHandler<ElapsedEventArgs>(this.timerCall_Elapsed), sender, new object[] { e });
                    return;
                }

                if (this.avHistoryEvent != null)
                {
                    TimeSpan duration = (DateTime.Now - this.avHistoryEvent.StartTime);
                    this.labelDuration.Content = string.Format("{0:D2}:{1:D2}:{2:D2}", duration.Hours, duration.Minutes, duration.Seconds);
                }
            }
            catch (TargetInvocationException ex)
            {
                LOG.Error(ex);
            }
        }