title: Appending DataTables to an XML file
body: <p>I need to write multiple <code>DataTable</code>s to an XML file.</p>
  
  <p>Once I write a <code>DataTable</code> to an XML file, after that the second <code>DataTable</code> is overwriting the XML file.</p>
  
  <p>Is there any append method so that I can append multiple <code>DataTable</code>s to a single XML file??</p>