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);
}