private void btnDeleteTask_Click(object sender, RoutedEventArgs e)
        {
            using (var context = new WorkdeskContext())
            {
                var task = (WorkDeskManager.Desktop.Data.Task)TaskList.SelectedItem;
                if (null != task)
                {
                    context.Tasks.Attach(task);
                context.Tasks.Remove(task);
                context.SaveChanges();

                }
            }
        }
        private void TaskList_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            using (var context = new WorkdeskContext())
            {
                WorkDeskManager.Desktop.Data.Task taskSelected = context.Tasks.Find(((WorkDeskManager.Desktop.Data.Task)TaskList.SelectedItem).Id);
                if (taskSelected != null)
                {
                    txtWorksheetUrl.Text = taskSelected.WorksheetUrl;
                    var activities = context.Activities.Where(t => t.Task.Id == taskSelected.Id).ToList();
                    if (activities != null)
                    {
                        ActivityList.ItemsSource = activities;
                        ActivityList.DisplayMemberPath = "Description";
                       ActivityList.Items.Refresh();
                    }

                }

            }
        }
        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            DispatcherTimer timer = new DispatcherTimer();
            timer.Tick += timer_Tick;
            timer.Interval = new TimeSpan(0, 0, Properties.Settings.Default.IntervalSecs);
            timer.Start();
            //TaskList.items
            using (var context = new WorkDeskManager.Desktop.Data.WorkdeskContext())
            {
                var taskList = context.Tasks.ToList();
                if (taskList != null)
                {
                TaskList.ItemsSource = taskList;
                TaskList.DisplayMemberPath = "Name";
                }

            }
        }