title: HTML Agility pack create new HTMLNode
body: <p>I'm using HTML Agility Pack to parse and transform a HTML file, but I get an exception "Item has already been added" when try to create a new HTMLNode because of the index parameter. </p>
  
  <pre><code>HtmlNode node1 = new HtmlNode(HtmlNodeType.Element, doc, 0); 
  node1.Name = "div"; 
  
  HtmlNode node2 = new HtmlNode(HtmlNodeType.Element, doc, 0); 
  node2.Name = "div"; 
  </code></pre>