DataSet ds = new DataSet("myDS"); ds.ReadXmlSchema("myXsd.xsd"); ds.ReadXml("myXml.xml"); && "file not found..." on this line * will not compile "The type or namespace 'Server' could not be found..." ds.ReadXmlSchema(Server.MapPath("myXsd.xsd")); ds.ReadXml(Server.MapPath("myXml.xml"));I am amazed (again) at the level of confusion in .NET. Reading from or writing to an XML must be the most basic thing to do in a mobile app. There are snippets of code scattered in hundred of places in the help, but none of them is a complete example that works.