Why does HtmlElement's GetAttribute() method return "mshtml.HTMLInputElementClass" instead of the attribute's value?

Why does HtmlElement's GetAttribute() method return mshtml.HTMLInputElementClass instead of the attribute's value, when I'm trying to obtain the value of a form's action attr开发者_如何学运维ibute?

HtmlElementCollection elements = webBrowser1.Document.Forms;
   foreach (HtmlElement element in elements)
        MessageBox.Show(element.GetAttribute("action") + "");

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It seems to be an IE bug.

Here is a solution : add a reference to Microsoft.mshtml, then :

if(element.GetAttribute("action").Equals("mshtml.HTMLInputElementClass"))
{
    mshtml.IHTMLFormElement iForm = (mshtml.IHTMLFormElement)element.DomElement; 
    string action = iForm.action;
}

Hope this help :)