Private Sub PrintDomBegin()
    If (WebBrowser1.Document IsNot Nothing) Then
        Dim ElemColl As HtmlElementCollection

        Dim Doc As HtmlDocument = WebBrowser1.Document
        If (Not (Doc Is Nothing)) Then
            ElemColl = Doc.GetElementsByTagName("HTML")
            Dim Str As String = PrintDom(ElemColl, New System.Text.StringBuilder(), 0)

            WebBrowser1.DocumentText = Str
        End If
    End If
End Sub

Private Function PrintDom(ByVal ElemColl As HtmlElementCollection, ByRef ReturnStr As System.Text.StringBuilder, ByVal Depth As Integer) As String
    Dim Str As New System.Text.StringBuilder()

    For Each Elem As HtmlElement In ElemColl
        Dim ElemName As String

        ElemName = Elem.GetAttribute("ID")
        If (ElemName Is Nothing Or ElemName.Length = 0) Then
            ElemName = Elem.GetAttribute("name")
            If (ElemName Is Nothing Or ElemName.Length = 0) Then
                ElemName = "<no name>"
            End If
        End If

        Str.Append(CChar(" "), Depth * 4)
        Str.Append(ElemName & ": " & Elem.TagName & "(Level " & Depth & ")")
        ReturnStr.AppendLine(Str.ToString())

        If (Elem.CanHaveChildren) Then
            PrintDom(Elem.Children, ReturnStr, Depth + 1)
        End If

        Str.Remove(0, Str.Length)
    Next

    PrintDom = ReturnStr.ToString()
End Function

        private void PrintDomBegin()
        {
            if (webBrowser1.Document != null)
            {
                HtmlElementCollection elemColl = null;
                HtmlDocument doc = webBrowser1.Document;
                if (doc != null)
                {
                    elemColl = doc.GetElementsByTagName("HTML");
                    String str = PrintDom(elemColl, new System.Text.StringBuilder(), 0);
                    webBrowser1.DocumentText = str;
                }
            }
        }

        private string PrintDom(HtmlElementCollection elemColl, System.Text.StringBuilder returnStr, Int32 depth)
        {
            System.Text.StringBuilder str = new System.Text.StringBuilder();

            foreach (HtmlElement elem in elemColl)
            {
                string elemName;

                elemName = elem.GetAttribute("ID");
                if (elemName == null || elemName.Length == 0)
                {
                    elemName = elem.GetAttribute("name");
                    if (elemName == null || elemName.Length == 0)
                    {
                        elemName = "<no name>";
                    }
                }

                str.Append(' ', depth * 4);
                str.Append(elemName + ": " + elem.TagName + "(Level " + depth + ")");
                returnStr.AppendLine(str.ToString());

                if (elem.CanHaveChildren)
                {
                    PrintDom(elem.Children, returnStr, depth + 1);
                }

                str.Remove(0, str.Length);
            }

            return(returnStr.ToString());
        }