Validation callback : Validation « GUI Windows Forms « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. GUI Windows Forms
3. Validation

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);
    }
}