public void TaskActivated()
{
activeSession = new TaskSession ();
documentStore.RestoreMemento ();
}
public void TaskDeactivated()
{
documentStore.CaptureMemento ();
activeSession.EndTime = DateTime.Now;
Sessions.Add (activeSession);
// move the item to a new session
activeSession = new TaskSession ();
// Store the task information by triggering an update
TaskForceMain.Instance.StartTFStoreUpdate ();
}