public void RemoveTopic(Section section, Topic topic)
 {
     section.RemoveTopic(topic);
 }
 /// <summary>
 /// Transfers topic from one section to another
 /// </summary>
 /// <param name="topicId"></param>
 /// <param name="sourceId"></param>
 /// <param name="destId"></param>
 public void TransferTopic(Topic topic, Section source, Section dest)
 {
     dest.AddTopic(topic);
     source.RemoveTopic(topic);
 }