public String getData(int row, int col) {
      if (row < 0
         || col < 0
         || row > (getRowsCount() - 1)
         || col > (getColsCount() - 1)) {
         return null;
      }
      try {
         Vector theRow = (Vector)m_fileContent.get(row);
         String result = (String)theRow.get(col);
         return (result == null ? "" : result);
      } catch (IndexOutOfBoundsException e) {
         return "";
      }
   }