using(BufferedStream stream = new BufferedStream(new MemoryStream()))
{    
stream.Write(Encoding.ASCII.GetBytes("foo"), 0, "foo".Length);    
stream.Seek(0, SeekOrigin.Begin);    
StreamReader sr = new StreamReader(stream);    
XmlReader reader = XmlReader.Create(sr);    
while (reader.Read())    
{         
Console.WriteLine(reader.Value);    
}
}