public void Save(TextDocument textDocument)
        {
            m_textDocument = textDocument;
            m_bookMarkStorage.Clear();

            EditPoint hEP = m_textDocument.StartPoint.CreateEditPoint();

            while (hEP.NextBookmark())
            {
                if (m_bookMarkStorage.Contains(hEP.Line))
                {
                    break;
                }
                m_bookMarkStorage.Add(hEP.Line);
            }
        }