XmlDocument doc = new XmlDocument();
doc.Load(Server.MapPath("rss.xml"));
XslTransform xslt=new XslTransform();
xslt.Load(Server.MapPath("rss.xslt"));
XsltArgumentList xslArg =new XsltArgumentList();
Stream str =new MemoryStream();
xslt.Transform(doc,null,str);
str.Flush();
str.Position = 0;
StreamReader sr =new StreamReader(str);
string xmlOut = sr.ReadToEnd();
sr.Close();
Response.Write(xmlOut);