XML Visual C++ .NET

#include "stdafx.h"
#using 
using namespace System;
using namespace System::Xml;
using namespace System::Xml::Schema;
ref class ValidateXML
{
public:
    ValidateXML(String ^filename)
    {
        XmlReader ^vreader;
        try
        {
            XmlReaderSettings ^settings = gcnew XmlReaderSettings();
            settings->ProhibitDtd = false;
            settings->ValidationType = ValidationType::DTD;
            vreader = XmlReader::Create(filename, settings);
     
            while(vreader->Read())
            {
                // ... Process nodes just like XmlTextReader()
            }
            Console::WriteLine("Finished Processing");
        }
        catch (Exception ^e)
        {
            Console::WriteLine(e->Message);
        }
        finally
        {
            if (vreader->ReadState != ReadState::Closed)
            {
                vreader->Close();
            }
        }
    }
};
void main()
{
    gcnew ValidateXML("Bad.xml");
    gcnew ValidateXML("good.xml"); 
}