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Validation callback

using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.Xml; using System.Xml.XPath; using System.Xml.Schema; public class MainClass {     public static void Main()     {         XmlDocument doc;         XPathNavigator editor2;         XmlWriter writer;         XmlSchemaSet schemaSet;         ValidationEventHandler handler;         doc = new XmlDocument();         doc.Load("pubs.xml");         foreach (XPathNavigator editor in doc.CreateNavigator().Select("/pubs/titles[authors/@au_lname='Green']"))         {             editor2 = editor.SelectSingleNode("authors[@au_lname!='Green']");             if (editor2 != null) editor2.DeleteSelf();             writer = editor.AppendChild();             writer.WriteStartElement("authors");             writer.WriteAttributeString("au_lname", "MacFeather");             writer.WriteAttributeString("au_fname", "Stearns");             writer.Close();         }         XPathNavigator editor3 = doc.CreateNavigator();         schemaSet = new XmlSchemaSet();         schemaSet.Add(null, "pubs.xsd");         schemaSet.Compile();         handler = new System.Xml.Schema.ValidationEventHandler(ValidationCallback);         doc.Save("output.xml");     }     public static void ValidationCallback(object sender, ValidationEventArgs e)     {         System.Console.WriteLine(e.Message);     } }