title: How to append new item into serialized xml data without deserialize old data?
body: <p>Normally, I use the following code to serialize object to XML file. Everyday, I have about 100-1000 new items to be added into this list in different period of time.</p>
  
  <pre><code>var xmlSerializer = new XmlSerializer(typeof(List&lt;TestModel&gt;));
  xmlSerializer.Serialize(stream, list);
  </code></pre>
  
  <p>How to append new item into serialized xml data without deserialize old data?</p>
  
  <p><strong>Thanks,</strong></p>