Validate xml against DTD

[C# Programming]

Hi guys,

Hope you are doing well.

I have a Onix complaint XML document that I want to validate it with some Onix complaint DTD. I did coding for same in C#

XmlReaderSettings settings = null;
try
{

string xmlPath = Server.MapPath("XML/nielsen_onix.XML");


//Load XML into XmlTextReader
// reader = new XmlTextReader(xmlPath);
//Load XmlTextReader into XmlValidatingReader
settings = new XmlReaderSettings();

//Set the validation type
settings.ValidationType = ValidationType.DTD;
settings.ProhibitDtd = false;
settings.CheckCharacters = false;
//Hook up the XmlValidatingReader’s
//ValidationEventHandler to a call
//back method named ValidationCallBack
settings.ValidationEventHandler += new ValidationEventHandler(
this.ValidationCallBack);
XmlReader reader = XmlReader.Create(xmlPath, settings);
//Read through the XML document by calling
//the Read() method
while (reader.Read()) { }

//Check boolean field named valid (located at top of code)
if (valid)
Response.Write("Validation is Successful!");
reader.Close();
}
catch(Exception ex) {
Response.Write(ex.Message);
}

This code runs good and show the xml file invaid while my xml file is valid when I validated it on
http://www.w3schools.com/XML/xml_validator.asp[^ (http://www.w3schools.com/XML/xml_validator.asp)]

Could you please check what's wrong going with me?

Any help would be highly appreciable.

Thanks
Rohit