C# Parsing JSP webpage?

How to parse this site? It looks like HTML but actually, it is a java web page JSP. StockMarketSite Needed to GET the PSEI data only. been using HTML Agility Pack (But it is JSP file not HTML) here is my code:

    HtmlWeb web = new HtmlWeb();
    var doc = await Task.Factory.StartNew(() => 
    web.Load("http://ift.tt/19TICDG"));
    var nodes = doc.DocumentNode.SelectNodes("//*[@id=\"ext - gen311\"]//div//table//tr//td//div//a");
    var innertext = nodes.Select(node => node.InnerText);

It Returns me cannot load a null value.