I am currently using saxon.Net 9.2 for a project. I try to apply 2 different stylesheets to a document and then save the output.

Here is the transformation code.
                        // Load xmlDoc with a string containing the xml document.

                        Processor proc = new Processor();
                XsltCompiler comp = proc.NewXsltCompiler();
                FileStream stylesheetFileStream = new FileStream(self.GetRaw<string>("stylesheet"), FileMode.Open, FileAccess.Read);

                comp.BaseUri = new Uri(self.GetRaw<string>("stylesheet"));
                comp.ErrorList = new System.Collections.ArrayList();
                    exec = comp.Compile(stylesheetFileStream);
                catch (Exception ex)
                    throw ex;
                XsltTransformer transf = exec.Load();
                MemoryStream mstream = new MemoryStream(System.Text.Encoding.UTF8.GetBytes(xmlDoc), true);
                transf.SetInputStream(mstream, new Uri(self.GetRaw<string>("stylesheet")));

                StringWriter strWriter = new StringWriter();
                XmlTextWriter xtw = new XmlTextWriter(strWriter);
                TextWriterDestination dest = new TextWriterDestination(xtw);

This code is inside a method that is called twice and set the xmlDoc variable to result of the previous call.

When I run it, I get a "Content is not allowed in prolog." exception although my file seems valid. (I can apply the two stylesheets using the saxon executable.);

Here is the beginning of the result of the first transformation (the crash occurs at the second):

<?xml version="1.0" encoding="utf-16"?><html xmlns:ms="urn:anything" xmlns:MSHelp="http://msdn.microsoft.com/msHelp" xml:lang="en" lang="en"><head><title>MappGetError</title><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><meta name="xml-files-root" content="../../" /><meta name="manual-name" content="MIL-command-reference" /><meta name="manual-version" content="" /><meta name="generation-time" content="~generation-time~" /><meta name="xml-timestamp" content="~xml-timestamp~" /><link id="staticCSS" href="../../CSS Files/Matrox.Imaging.Common.css" rel="stylesheet" type="text/css" /><script language="JavaScript" src="../../JS Files/jquery-1.2.6.min.js" /><script language="JavaScript" src="../../JS Files/Matrox.Imaging.Utils.js" /><script language="JavaScript" src="../../JS Files/Matrox.Imaging.AbstractEventModel.js" /><script language="JavaScript" src="../../JS Files/Matrox.Imaging.Menu.js" /><script language="JavaScript" src="../../JS Files/Matrox.Imaging.Common.js" /></head><script type="text/javascript">

    Controller.singleton().supportedBoards = [

It is a bit messy, but there is nothing in the prolog except the xml declaration.

Thank you for your help.
Vincent Lambert
XML Programmer
Matrox Imaging