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using System.Xml;

private XmlDocument xmlDocument;

        private void XmlToTreeView(string path, TreeView treeView)
        {
            XmlDocument xmlDocument = new XmlDocument();
            xmlDocument.Load(new StringReader(path));
            treeView.Nodes.Clear();
            XmlRekursivImport(treeView.Nodes, xmlDocument.DocumentElement.ChildNodes);
        }

        private void XmlRekursivImport(TreeNodeCollection elem, XmlNodeList xmlNodeList)
        {
            try
            {
                TreeNode treeNode;
                foreach (XmlNode myXmlNode in xmlNodeList)
                {
                    treeNode = new TreeNode(myXmlNode.Attributes["value"].Value);

                    if (myXmlNode.ChildNodes.Count > 0)
                    {
                        XmlRekursivImport(treeNode.Nodes, myXmlNode.ChildNodes);
                    }
                    elem.Add(treeNode);
                }
            }
            catch { }
        }

       public string TreeViewToXml(TreeView treeView)
        {
            xmlDocument = new XmlDocument();
            xmlDocument.AppendChild(xmlDocument.CreateElement("ROOT"));
            XmlRekursivExport(xmlDocument.DocumentElement, treeView.Nodes);
            StringWriter sw = new StringWriter();
            XmlTextWriter tx = new XmlTextWriter(sw);
            xmlDocument.WriteTo(tx);
            tx.Close();
            sw.Close();
            return sw.ToString();
        }

        private XmlNode XmlRekursivExport(XmlNode nodeElement, TreeNodeCollection treeNodeCollection)
        {
            XmlNode xmlNode = null;
            foreach (TreeNode treeNode in treeNodeCollection)
            {
                xmlNode = xmlDocument.CreateElement("TreeViewNode");

                xmlNode.Attributes.Append(xmlDocument.CreateAttribute("value"));
                xmlNode.Attributes["value"].Value = treeNode.Text;


                if (nodeElement != null)
                    nodeElement.AppendChild(xmlNode);

                if (treeNode.Nodes.Count > 0)
                {
                    XmlRekursivExport(xmlNode, treeNode.Nodes);
                }
            }
            return xmlNode;
        }