System.Xml.Xsl.XslTransform RssXslt = new System.Xml.Xsl.XslTransform();  
System.Xml.XmlDocument RssXml = new System.Xml.XmlDocument();  
RssXslt.Load(Server.MapPath("RssReader.xslt"));  
RssXml.Load(Server.MapPath("Rss.xml"));  
System.IO.MemoryStream t = new System.IO.MemoryStream();  
RssXslt.Transform(RssXml,null,t,null);  
string resultString = System.Text.UTF8Encoding.UTF8.GetString(t.ToArray());  
Response.Write(resultString);  

System.Xml.Xsl.XslTransform RssXslt = new System.Xml.Xsl.XslTransform();  
System.Xml.XmlDocument RssXml = new System.Xml.XmlDocument();  
RssXslt.Load(Server.MapPath("RssReader.xslt"));  
RssXml.Load(Server.MapPath("Rss.xml"));  
System.Text.StringBuilder t = new System.Text.StringBuilder();  
RssXslt.Transform(RssXml,null,new System.IO.StringWriter(t),null);  
string resultString = t.ToString();  
Response.Write(resultString);