Need help with "obsolete" code - .Transform

[mendhak]

I have this in a file:

        internal XmlTextReader GetXmlReaderFromXPathDoc(XPathDocument xmldoc, string TreeNodeXsltSrc)
        {
            // Load TreeNodeXsltSrc into XslTransform
            XslTransform xslTrans = new XslTransform();
            Uri uri = new Uri(Page.Request.Url, TreeNodeXsltSrc);
            xslTrans.Load(uri.AbsoluteUri);

            // Do transform
            MemoryStream stream = new MemoryStream();
            xslTrans.Transform(((IXPathNavigable)xmldoc).CreateNavigator(), null, stream);
            stream.Position = 0;
            return new XmlTextReader(stream);
        } 

I didn't write this code, it's part of the IE web controls source, and I have to compile this. However, when I try to compile it, I get this:

'System.Xml.Xsl.XslTransform.Transform(System.Xml.XPath.XPathNavigator,
System.Xml.Xsl.XsltArgumentList, System.IO.Stream)' is obsolete: 'You
should pass XmlResolver to Transform() method'

I cannot figure out how to make this code conform to the 'newer' standards. Can anyone help?