using System;

using System.IO;

using System.Xml;

using System.Xml.Linq;

using System.Xml.Xsl;

public class Program

{

    public static void Main()

    {

        var xml = @"<a class=""tlink"" href=""#"" target=""_blank"">Click to get feed</a>";

        var xsl = @"<?xml version=""1.0"" encoding=""UTF-8""?>

<xsl:stylesheet version=""1.0"" xmlns:xsl=""http://www.w3.org/1999/XSL/Transform"">

    <xsl:strip-space elements=""*"" />

    <xsl:template match=""/"">

        <div>

        <div class=""test""></div>

        <i class=""test""></i>

        </div>

    </xsl:template>

</xsl:stylesheet>";

        var html = TransformXml(xml, xsl);

        Console.WriteLine(html);

    }

    public static string TransformXml(string xml, string xslt)

    {

        var transformedDocument = new XDocument();

​

        using (var xsltStringReader = new StringReader(xslt))

        {

            var xmlReaderSettings = new XmlReaderSettings();

            xmlReaderSettings.DtdProcessing = DtdProcessing.Parse;

            using (XmlReader xsltReader = XmlReader.Create(xsltStringReader, xmlReaderSettings))

            {

                var transformer = new XslCompiledTransform();

                transformer.Load(xsltReader);

                using (var xmlStringReader = new StringReader(xml))

                {

                    using (XmlReader xmlReader = XmlReader.Create(xmlStringReader, xmlReaderSettings))

                    {

                        using (XmlWriter newDocumentWriter = transformedDocument.CreateWriter())

                        {

                            transformer.Transform(xmlReader, newDocumentWriter);

                        }

                    }

                }

            }

        }

​

        return transformedDocument.ToString();

    }

}