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c# - System.__ComObject is returned when I use getAttribute

I am running this code:

HtmlElement.GetAttribute("onClick")

To try and get access to the onClick attribute of that element, but all this returns is System.__ComObject. I don't know why this happens, all other GetAttribute calls return the actual string.

Thanks.

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Sample code

Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
    WebBrowser1.Navigate("http://stackoverflow.com/questions/9707869/system-comobject-is-returned-when-i-use-getattribute")
End Sub

Private Sub WebBrowser1_DocumentCompleted(sender As Object, e As System.Windows.Forms.WebBrowserDocumentCompletedEventArgs) Handles WebBrowser1.DocumentCompleted
    Dim a As HtmlElement = WebBrowser1.Document.GetElementById("portalLink").FirstChild
    MsgBox(a.DomElement.attributes("onclick").value.ToString)
End Sub

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