C# WebBrowser control -- Get Document Elements After AJAX?

I solved the problem for me.

the key is, attaching a handler for onPropertyChanged event of the div element which is being populated via ajax call.

HtmlElement target = webBrowser.Document.GetElementById("div_populated_by_ajax");if (target != null){      target.AttachEventHandler("onpropertychange", handler);}

and finally,

private void handler(Object sender, EventArgs e){      HtmlElement div = webBrowser.Document.GetElementById("div_populated_by_ajax");      if (div == null) return;      String contentLoaded = div.InnerHtml; // get the content loaded via ajax}

using System;using System.Windows.Forms;namespace WebBrowserDemo{    class Program    {        public const string TestUrl = "http://www.w3schools.com/Ajax/tryit_view.asp?filename=tryajax_first";        [STAThread]        static void Main(string[] args)        {            WebBrowser wb = new WebBrowser();            wb.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(wb_DocumentCompleted);            wb.Navigate(TestUrl);            while (wb.ReadyState != WebBrowserReadyState.Complete)            {                Application.DoEvents();            }            Console.WriteLine("\nPress any key to continue...");            Console.ReadKey(true);        }        static void wb_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)        {            WebBrowser wb = (WebBrowser)sender;            HtmlElement document = wb.Document.GetElementsByTagName("html")[0];            HtmlElement button = wb.Document.GetElementsByTagName("button")[0];            Console.WriteLine(document.OuterHtml + "\n");            button.InvokeMember("Click");            Console.WriteLine(document.OuterHtml);                   }    }}

You will need to use DOM for it. Cast WebBrowser.Document.DomDocument to IHTMLDocument?. You will have to import some COM interfaces or Microsoft.mshtml assembly.

Have a look to http://msdn.microsoft.com/en-us/library/aa752641(VS.85).aspx for more details.