XML : catel serialize to XML

How to serialize a model, so I can use the standard methods of NET?

In normal serialization:

  //model as MainModel  var xmlSerializer = SerializationFactory.GetXmlSerializer();      xmlSerializer.OptimalizationMode = XmlSerializerOptimalizationMode.PrettyXmlAgressive;      Stream stream = new MemoryStream();      xmlSerializer.Serialize(model, stream);      string text = Encoding.UTF8.GetString((stream as MemoryStream).ToArray());    

I get:

  <?xml version="1.0" encoding="utf-8"?>  <MainModel graphid="1" xmlns:ctl="http://catel.codeplex.com">  ...    

And then I try to:

  XmlDocument xmlDocument = new XmlDocument();  xmlDocument.PreserveWhitespace = true;  xmlDocument.LoadXml(MySerializedToXMLModel);    

I got error in LoadXML.