export of a treeview to xml

[231166]

Hi,

i have created a treeview and have created a code to export it to xml format.
Now i would like to give a user to export the part of the treeview he has choiced to xml format.
In fact, by 'part' i mean from a root , it means from each first level of the treeview.
For example, if the treeview is constructed like this

1
2
3
4



5
6
7
8

The number 1 and 5 are the root of the treeview; if the user clicks on the level 1 or 5 he can see all the level below( it means 2 , 3 and 4).
I can telle you that the level one has a tag which form is "MT"+number and all the level below have a tag which form is "GT"+number.
the code i have for the moment is this one

Private Sub ExportTreeviewToXml(ByVal TreeView As TreeView, ByVal OutputPath As String)

        'open a file stream and wrap it with an XmlTextWriter 
        'ouvrez un flux pour en faire un futur fichier situé dans le chemin préciséet enveloppez le d'un XmlTextWriter
        Dim clsStream As System.IO.FileStream = System.IO.File.Create(OutputPath)


        Dim clsWriter As New System.Xml.XmlTextWriter(clsStream, System.Text.Encoding.UTF8)
        clsWriter.Formatting = Xml.Formatting.Indented

        ' start document... 
        clsWriter.WriteStartDocument()
        clsWriter.WriteStartElement("TreeView")

        'use a recursive function to write out the tree nodes as Xml nodes. 
        Call ExportTreeviewNodesToXml(TreeView.Nodes, clsWriter)

        'close writer / stream... 
        clsWriter.WriteEndElement()
        clsWriter.Flush()
        clsWriter.Close()
        'clsStream.Dispose()

    End Sub

If you could help me on this point it would be very kind from you.

Best regards.

Nathalie