Создание XML документа в С#

XsltArgumentList arguments = null;

XslTransform xslt = new XslTransform();
xslt.Load(this.Context.Request.PhysicalApplicationPath + "/questions.xsl");

XmlTextReader tr = new XmlTextReader(this.Context.Request.PhysicalApplicationPath + "/questions.xml");
XPathDocument xpd = new XPathDocument(tr);
XPathNavigator xpn;
xpn = xpd.CreateNavigator();

XPathNodeIterator iter;
iter = xpn.Select("/Questions/TestInformation/TestID");
iter.MoveNext();
string surveyNumber = iter.Current.Value;

XmlTextWriter textWriter = new XmlTextWriter(this.Context.Request.PhysicalApplicationPath + "questions" + surveyNumber + ".html", null);

arguments = new XsltArgumentList();
arguments.AddParam("conference","",ddpConferences.SelectedItem.Text);

xslt.Transform(xpn, arguments, textWriter);

textWriter.Close();
           
StringWriter writer = new StringWriter();
xslt.Transform(xpn, arguments, writer);
writer.Close();

tr.Close();