C# WebBrowser control — Get Document Elements After AJAX?

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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
}

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