[.net] Validating XML documents

XmlValidatingReader reader = new XmlValidatingReader("http://www.gamedev.net/xml/");reader.XmlResolver = new XmlUrlResolver();

using System;using System.Xml;namespace RssReader{	/// <summary>	/// Summary description for Class1.	/// </summary>	class Class1	{		static int i = 0;		/// <summary>		/// The main entry point for the application.		/// </summary>		static void Main(string[] args)		{			//saved via Internet Explorer -WORKS!			Load("../../Data/gdnet.xml");			//manually cached to disk -WORKS!			System.Net.WebRequest wr = System.Net.WebRequest.Create("http://www.gamedev.net/xml");			System.Net.WebResponse wresp = wr.GetResponse();			System.IO.StreamReader sr = new System.IO.StreamReader(wresp.GetResponseStream());			System.IO.StreamWriter sw = new System.IO.StreamWriter("temp.xml");			sw.Write(sr.ReadToEnd());			sw.Close();			sr.Close();			wresp.Close();			Load("temp.xml");			//loaded direct from web -FAILS!			Load("http://www.gamedev.net/xml/");		}		static void Summarize(Rss.Feed feed)		{			Console.WriteLine("<{0}>\n\t{1}\n</{0}>",feed.Channel.Title, feed.Channel.Description);		}		static void Load(string URL)		{			Console.WriteLine("Attempting load #{0}: {1}",i, URL);			XmlTextReader reader = new XmlTextReader(URL);			reader.Read();			Console.WriteLine("   reader has value: {0}",reader.Value);			XmlValidatingReader validator = new XmlValidatingReader(reader);			validator.ValidationType = ValidationType.None;			Console.WriteLine("   validator has value: {0}", validator.Value);						XmlDocument doc = new XmlDocument();			doc.Load(validator);			Console.WriteLine("   document's first child has value: {0}", doc.FirstChild.Value);			if(doc.HasChildNodes)			{				Console.WriteLine("      Document has {0} child nodes.", doc.ChildNodes.Count);			}			Console.WriteLine("Succesful load #{0}\n",i++);		}	}}

Attempting load #0: ../../Data/gdnet.xml   reader has value: version="1.0"   validator has value: version="1.0"   document's first child has value:      Document has 2 child nodes.Succesful load #0Attempting load #1: temp.xml   reader has value: version="1.0"   validator has value: version="1.0"   document's first child has value:      Document has 2 child nodes.Succesful load #1Attempting load #2: http://www.gamedev.net/xml/   reader has value: version="1.0"   validator has value: version="1.0"Unhandled Exception: System.Xml.XmlException: The expected DTD markup was not found. Line 1, position 3.   at System.Xml.XmlScanner.ScanDtdContent()   at System.Xml.Schema.DtdParser.ScanDtdContent()   at System.Xml.Schema.DtdParser.ParseDtdContent()   at System.Xml.Schema.DtdParser.ParseDocTypeDecl()   at System.Xml.Schema.DtdParser.Parse()   at System.Xml.XmlTextReader.ParseDtd(XmlScanner scanner)   at System.Xml.XmlTextReader.ParseTag()   at System.Xml.XmlTextReader.ParseRoot()   at System.Xml.XmlTextReader.Read()   at System.Xml.XmlValidatingReader.ReadWithCollectTextToken()   at System.Xml.XmlValidatingReader.Read()   at System.Xml.XmlLoader.LoadCurrentNode()   at System.Xml.XmlLoader.LoadDocSequence(XmlDocument parentDoc)   at System.Xml.XmlLoader.Load(XmlDocument doc, XmlReader reader, Boolean preserveWhitespace)   at System.Xml.XmlDocument.Load(XmlReader reader)   at RssReader.Class1.Load(String URL) in c:\documents and settings\smcbeth\mydocuments\visual studio projects\rssreader\class1.cs:line 56   at RssReader.Class1.Main(String[] args) in c:\documents and settings\smcbethmy documents\visual studio projects\rssreader\class1.cs:line 37Press any key to continue

//don't do this for RSS 0.91 using a DTD for validationSystem.Xml.XmlTextReader reader = new System.Xml.XmlTextReader("http://www.gamedev.net/xml");//instead do thisSystem.Net.WebRequest request = System.Net.WebRequest.Create("http://www.gamedev.net/xml");System.Net.WebResonce responce = request.GetResponce();System.IO.Stream stream = responce.GetStream();System.Xml.XmlTextReader reader = new System.Xml.XmlTextReader(stream);