Convert Xml To Html To Pdf

I am developing in C# with the 4.0 .Net Framework.  I am needing to take raw XML that a third-party sends us, apply a style sheet (also supplied by this third-party) to the XML, and then take the HTML that is generated from that, and save it as a PDF.

I am using XSLTransform to apply a style sheet to the XML, and get HTML generated.  I have that working.  However, I am struggling with how to convert that HTML to a PDF.  

Any suggestions?  Preferrable, there is already a solution for this by using the 4.0 .Net Framework;  preferrable I will not have to install any new libraries.  

If I can get the HTML to a System.Drawing.Image, I can then save that as a PDF.  We have PDFSharp that I can use for manipulating PDF's.

I have seen a lot of posts on this topic, but most posts that I have found seem older, and require downloading or purchasing new libraries.  I am hoping a more current solution exists.

Here is my code for applying the style sheet to the XML.  I have the HTML available in my XMLWriter, or in my "outputString".  (I am not convinced this is the best way to apply a style sheet to XML, so if there are any suggestions on better ways to do this, those are welcome).

string outputString = string.Empty;

                            XslCompiledTransform xslTransform = new XslCompiledTransform();
                            XsltSettings xsltSettings = new XsltSettings(true, true);
                            XmlUrlResolver resolver = new XmlUrlResolver();
                            xslTransform.Load("./ISOResultStyleSheetFiles/CS_XML_Output.xsl", xsltSettings, resolver);

                            using (StringReader sri = new StringReader(result.Result))
                            {
                                using (XmlReader xri = XmlReader.Create(sri))
                                {
                                    using (StringWriter sw = new StringWriter())
                                    {
                                        using (XmlWriter xwo = XmlWriter.Create(sw, xslTransform.OutputSettings))
                                        {
                                            xslTransform.Transform(xri, xwo);
                                            outputString = sw.ToString();
                                        }
                                    }
                                }
                            }

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