XML transformation using XSLT

XmlDocument oDoc = new XmlDocument();
XslTransform oTransfer = new XslTransform();

oDoc.LoadXml(txtXMLFileName.Text);

MemoryStream ms = new MemoryStream();
XmlTextWriter output = new XmlTextWriter(ms, Encoding.UTF8);

oTransfer.Load(txtXSLFileName.Text);
oTransfer.Transform(oDoc, null, output);
output.Flush();
ms.Position = 0;
StreamReader sr = new StreamReader(ms);

txtOutput.Text = sr.ReadToEnd();