I have wsdl from third party server. Method that i'm interested in returns XmlNode. My thought was wrap web methods and use XmlSerializer to return strongly typed objects. Returned xml looks like this (i removed soap headers):

<Response xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
        xsi:type="ResponseExt" 
        xmlns="http://www.thirdparty.com/lr/">
  <Code>0</Code>
  <Message>SUCCESS</Message>
  <SessionId>session_token</SessionId>
</Response>

Looked simple. Created a class:

[XmlRoot("Response")]
public class MyClass {
    public string Code {get; set;}
    public string Message {get; set;}
    public string SessionId {get; set;}
}

Processing time:

//XmlNode node = xml from above
XmlSerializer serializer = new XmlSerializer(typeof(MyClass));
XmlNodeReader reader =  new XmlNodeReader(node);
Myclass myclass = serializer.Deserialize(reader) as MyClass

Last line is where it blows up with inner exception message: The specified type was not recognized: name='ResponseExt', namespace='http://www.thirdparty.com/lr/', at . I can't figure out how to make Serializer happy and what exactly these two mean

xsi:type="ResponseExt" xmlns="http://www.thirdparty.com/lr/

As always any advice and pointer are appreciated