private void detach_DocumentUnDirectTeaches(DocumentUnDirectTeach entity)
		{
			this.SendPropertyChanging();
			entity.UnDirectTeach = null;
		}
 partial void UpdateDocumentUnDirectTeach(DocumentUnDirectTeach instance);
 partial void DeleteDocumentUnDirectTeach(DocumentUnDirectTeach instance);
 partial void InsertDocumentUnDirectTeach(DocumentUnDirectTeach instance);