private void UpdateListOfHeader(Clipping clipping)
        {
            ClippingsHeader header = FindClippingsHeader(clipping.Author, clipping.Title);

            if(header == null)
            {
                header = new ClippingsHeader(clipping.Author, clipping.Title);
                m_ListOfHeaders.Add(header);
            }

            header.ListOfClippings.Add(clipping);
        }
        public string GetListOfAllClippingsForSingleHeader(ClippingsHeader header)
        {
            StringBuilder stringBuilder = new StringBuilder();

            if (header != null)
            {
                foreach (Clipping clipping in header.ListOfClippings)
                {
                    stringBuilder.Append(clipping.Text);
                    stringBuilder.Append(Environment.NewLine);
                    stringBuilder.Append(Environment.NewLine);
                }
            }

            return stringBuilder.ToString();
        }