How to write some XML into IsolatedStorage?

[C#]

Stream mystream = new IsolatedStorageFileStream( storeFileName, FileMode.Create, isoStorage );
if( null != mystream )
{
XmlTextWriter xmlwriter = new XmlTextWriter(mystream, Encoding.UTF8);
      this.WriteDateToWriter( xmlwriter );
      xmlwriter.Flush();
stream.Close();
}