how to deserialize a sub class

[saliwen]

hi,all
I'v gotten a problerm of deserializing xml to object.the scene is:
I generated the classes using xsd tools including a class A and sub-class B,
then I deserialize from XmlNodeReader only has B's node, and no exception was
catched,and instance of B has been constructed,but has no data .

thanks for any help

[saliwen]

I got the key of the problerm:mismatch of the namespace.
the xml' namespace has prefix,but the XmlRootAttribute not .code as following:

class define:
........
[System.Xml.Serialization.XmlTypeAttribute(Namespac e="http://www.xxx.com/")]
[System.Xml.Serialization.XmlRootAttribute("B",
Namespace="http://www.xxx.com/", IsNullable=false)]
public class B: A{

/// <remarks/>
[System.Xml.Serialization.XmlElementAttribute(DataT ype="NMTOKEN")]
public string LinkedID;

/// <remarks/>
public addressType Sender;
......
}
-------------------------------------------------------------------
and XML file is:
------------------------------------------------------------------
<ns:B xmlns:ns="http://www.xxx.com/">
.........
</ns:B>