c# - Scraping using HtmlAgilityPackage -

i want extract comments following link using htmlagilitypackage using c#.the link follows http://www.ndtv.com/india-news/vyapam-scam-documents-show-chief-minister-shivraj-chouhan-delayed-probe-780528 code have created is

      var gethtmlweb = new htmlweb();         var document = gethtmlweb.load(txtinputurl.text);         var atags = document.documentnode.selectnodes("./div[@class='com_user_text']");         int counter = 1;         if (atags != null)         {             foreach (var atag in atags)             {                 lbloutput.text += lbloutput.text + ". " + atag.innerhtml + "\t" + "<br />";                 counter++;             }         } 

the variable atags returning null value. have tried using xpath //div[@class='newcomment_list']/ul/li/div[@class='headerwrap']/div[@class='com_user_text'] still same result.please me correct xpath.

thanks in advance