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XmlTextReader reader = new XmlTextReader("c:\\test\\foldersss.xml");
            while (reader.Read())
            {
                
                switch (reader.NodeType)
                {
                    case XmlNodeType.Element: // The node is an element.
                        Console.WriteLine("Start");
                        Console.WriteLine(reader.Name);
                        break;
                    case XmlNodeType.Text: //Display the text in each element.
                        Console.WriteLine(reader.Value);
                        Console.WriteLine("Stopp");
                        break;
                }
                
            }

            Console.WriteLine("fertig");
            Console.ReadKey();					

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<folders>
<folder>
   <subfolder>/</subfolder>
   <folderid>f797b19a-e848-45b9-98e8-a33202b612b8</folderid>
   <parentfolderid>00000000-0000-0000-0000-000000000000</parentfolderid>
</folder>
<folder>
   <subfolder>/Ausbildungsnachweise/</subfolder>
   <folderid>68688162-ea1d-4974-9e4f-6af497d5cc2f</folderid>
   <parentfolderid>f797b19a-e848-45b9-98e8-a33202b612b8</parentfolderid>
</folder>
<folder>
   <subfolder>/Ausbildungsnachweise/April/</subfolder>
   <folderid>6ac972bd-e78e-403a-9bf5-fc6be062144f</folderid>
   <parentfolderid>68688162-ea1d-4974-9e4f-6af497d5cc2f</parentfolderid>
</folder>
</folders>					

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XmlDocument xDoc = new XmlDocument();
            xDoc.Load("c:\\test\\foldersss.xml");
            foreach (XmlNode node in xDoc.SelectNodes("folders/folder"))
            {
                Console.WriteLine("Subfolder: " + node.SelectSingleNode("subfolder").InnerText);
                Console.WriteLine("folderid: " + node.SelectSingleNode("folderid").InnerText);
                Console.WriteLine("parentfolderid: " + node.SelectSingleNode("parentfolderid").InnerText);
            }