c# .Net XML using XmlDataDocument

Quite often, I need to parse files. I noticed that xml file is really easy to use and simple to define the format.
Last week, I send my mate an xml file scheme and he worked on putting data into xml file. I then read the xml
file and get out the data I need.
Here is some example code:

                    XmlDataDocument xmlDoc = new XmlDataDocument();
                    xmlDoc.Load(strFile);
                    XmlNamespaceManager nsMgr = new XmlNamespaceManager(xmlDoc.NameTable);
                    nsMgr.AddNamespace("xs", "http://www.w3.org/2001/XMLSchema");
                    nsMgr.AddNamespace("def", "http://www.w3.org/2001/XMLSchema");
                    XmlNodeList nodes = xmlDoc.SelectNodes("/def:xml_DataSet/def:something", nsMgr);
                    foreach (XmlNode n in nodes)
                    {
                        foreach (XmlAttribute a in n.Attributes)
                        {
                            switch (a.Name)
                            {
                            }
                        }

                        foreach (XmlNode m in n.ChildNodes)
                        {
                            switch (m.Name)
                            {
                            }
                        }
                     }