Dim LinksTable As Hashtable

Private Sub GetLinksFromFrames()
    LinksTable = New Hashtable()
    Dim FrameUrl As String

    If (WebBrowser1.Document IsNot Nothing) Then
        With WebBrowser1.Document
            Dim CurrentWindow As HtmlWindow = .Window
            If (CurrentWindow.Frames.Count > 0) Then
                For Each Frame As HtmlWindow In CurrentWindow.Frames
                    FrameUrl = Frame.Url.ToString()
                    Dim FrameLinksHash As New Hashtable()
                    LinksTable.Add(FrameUrl, FrameLinksHash)

                    For Each HrefElement As HtmlElement In Frame.Document.Links
                        FrameLinksHash.Add(HrefElement.GetAttribute("HREF"), "Url")
                    Next
                Next
            Else
                Dim DocLinksHash As New Hashtable()
                LinksTable.Add(.Url.ToString(), DocLinksHash)

                For Each HrefElement As HtmlElement In .Links
                    DocLinksHash.Add(HrefElement.GetAttribute("HREF"), "Url")
                Next
            End If
        End With
    End If
End Sub

        private void GetLinksFromFrames()
        {
            Hashtable linksTable = new Hashtable();
            string frameUrl;

            if (!(webBrowser1.Document == null))
            {
                HtmlWindow currentWindow = webBrowser1.Document.Window;
                if (currentWindow.Frames.Count > 0)
                {
                    foreach (HtmlWindow frame in currentWindow.Frames)
                    {
                        frameUrl = frame.Url.ToString();
                        Hashtable frameLinksHash = new Hashtable();

                        linksTable.Add(frameUrl, frameLinksHash);
                        foreach (HtmlElement hrefElement in frame.Document.Links)
                        {
                            frameLinksHash.Add(hrefElement.GetAttribute("HREF"), "Url");
                        }
                    }
                }
                else
                {
                    Hashtable docLinksHash = new Hashtable();
                    linksTable.Add(webBrowser1.Document.Url.ToString(), docLinksHash);

                    foreach (HtmlElement hrefElement in webBrowser1.Document.Links)
                    {
                        docLinksHash.Add(hrefElement.GetAttribute("HREF"), "Url");
                    }
                }
            }
        }