private const string xsltStyleSheet = "<xsl:stylesheet version='1.0' xmlns:xsl='http://www.w3.org/1999/XSL/Transform'\r\n"
            + "    xmlns:msxsl='urn:schemas-microsoft-com:xslt'\r\n"
            + "    xmlns:user='http://www.atmarkit.co.jp/sample/xslt/script'>\r\n"
            + "  <msxsl:script language='C#' implements-prefix='user'>\r\n"
            + "     <![CDATA[\r\n"
            + "        public string ToBase64( string s )\r\n"
            + "        {\r\n"
            + "            if( s.Length == 0 ) return \"\";\r\n"
            + "            byte [] ar = System.Text.Encoding.UTF8.GetBytes(s);\r\n"
            + "            return Convert.ToBase64String(ar);\r\n"
            + "        }\r\n"
            + "      ]]>\r\n"
            + "  </msxsl:script>\r\n"
            + "  <xsl:template match='name'>\r\n"
            + "    <name encode='base64'>\r\n"
            + "          <xsl:value-of select='user:ToBase64(.)'/>\r\n"
            + "    </name>\r\n"
            + "  </xsl:template>\r\n"
            + "</xsl:stylesheet>\r\n";

        private const string xmlDocument = "<name>間宮林蔵</name>";

        private void Form1_Load(object sender, System.EventArgs e)
        {
            XslTransform xslt = new XslTransform();
            xslt.Load( new XmlTextReader( new StringReader(xsltStyleSheet) ), null, this.GetType().Assembly.Evidence );
            XmlDocument document = new XmlDocument();
            document.LoadXml(xmlDocument);
            StringWriter swriter = new StringWriter();
            XmlTextWriter writer = new XmlTextWriter(swriter);
            xslt.Transform(document, null, writer, null );
            System.Diagnostics.Trace.Write( swriter.ToString() );
        }