Validating XML with XSD

	using System;
	using System.IO;
	using System.Xml;
	using System.Xml.Schema;
	using System.Xml.XPath;
	namespace XSD_fun
	{
	class Program
	{
	private static string xml =
	@"<?xml version=""1.0"" encoding=""utf-8"" ?>
	<bookstore xmlns = ""http://www.contoso.com/books"">
	<book genre=""autobiography"" publicationdate=""1981-03-22"" ISBN=""1-861003-11-0"">
	<title>The Autobiography of Benjamin Franklin</title>
	<author>
	<first-name>Benjamin</first-name>
	<last-name>Franklin</last-name>
	</author>
	<price>8.99</price>
	</book>
	<book genre = ""novel"" publicationdate=""1967-11-17"" ISBN=""0-201-63361-2"">
	<title>The Confidence Man</title>
	<author>
	<first-name>Herman</first-name>
	<last-name>Melville</last-name>
	</author>
	<price>11.99</price>
	</book>
	<book genre = ""philosophy"" publicationdate=""1991-02-15"" ISBN=""1-861001-57-6"">
	<title>The Gorgias</title>
	<author>
	<name>Plato</name>
	</author>
	<price>9.99</price>
	</book>
	</bookstore>";
	private static string xsd =
	@"<?xml version=""1.0"" encoding=""utf-8""?>
	<xs:schema attributeFormDefault = ""unqualified"" elementFormDefault=""qualified"" targetNamespace=""http://www.contoso.com/books"" xmlns:xs=""http://www.w3.org/2001/XMLSchema"">
	<xs:element name = ""bookstore"">
	<xs:complexType>
	<xs:sequence>
	<xs:element maxOccurs = ""unbounded"" name=""book"">
	<xs:complexType>
	<xs:sequence>
	<xs:element name = ""title"" type=""xs:string"" />
	<xs:element name = ""author"">
	<xs:complexType>
	<xs:sequence>
	<xs:element minOccurs = ""0"" name=""name"" type=""xs:string"" />
	<xs:element minOccurs = ""0"" name=""first-name"" type=""xs:string"" />
	<xs:element minOccurs = ""0"" name=""last-name"" type=""xs:string"" />
	</xs:sequence>
	</xs:complexType>
	</xs:element>
	<xs:element name = ""price"" type=""xs:decimal"" />
	</xs:sequence>
	<xs:attribute name = ""genre"" type=""xs:string"" use=""required"" />
	<xs:attribute name = ""publicationdate"" type=""xs:date"" use=""required"" />
	<xs:attribute name = ""ISBN"" type=""xs:string"" use=""required"" />
	</xs:complexType>
	</xs:element>
	</xs:sequence>
	</xs:complexType>
	</xs:element>
	</xs:schema>";
	private static string xmlFilename = "books.xml";
	private static string xsdFilename = "books.xsd";
	static void Main()
	{
	try
	{
	File.WriteAllText(xmlFilename, xml);
	File.WriteAllText(xsdFilename, xsd);
	XmlReaderSettings settings = new XmlReaderSettings();
	settings.Schemas.Add("http://www.contoso.com/books", xsdFilename);
	settings.ValidationType = ValidationType.Schema;
	XmlReader reader = XmlReader.Create(xmlFilename, settings);
	XmlDocument document = new XmlDocument();
	document.Load(reader);
	ValidationEventHandler eventHandler = new ValidationEventHandler(ValidationEventHandler);
	// the following call to Validate succeeds.
	document.Validate(eventHandler);
	// add a node so that the document is no longer valid
	XPathNavigator navigator = document.CreateNavigator();
	navigator.MoveToFollowing("price", "http://www.contoso.com/books");
	XmlWriter writer = navigator.InsertAfter();
	writer.WriteStartElement("anotherNode", "http://www.contoso.com/books");
	writer.WriteEndElement();
	writer.Close();
	// the document will now fail to successfully validate
	document.Validate(eventHandler);
	}
	catch (Exception ex)
	{
	Console.WriteLine(ex.Message);
	}
	}
	static void ValidationEventHandler(object sender, ValidationEventArgs e)
	{
	switch (e.Severity)
	{
	case XmlSeverityType.Error:
	Console.WriteLine("Error: {0}", e.Message);
	break;
	case XmlSeverityType.Warning:
	Console.WriteLine("Warning {0}", e.Message);
	break;
	}
	}
	}
	}

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