Serialization and Inheritance

[uAsking]

I'm building a client side application that uses webservices. In the client
application I'm inheriting from basic types used by the webservices, so the
wevservice provides the classes and sets all the serialization attributes for
them.

The classes are in a very basic structure with a Single object that contains
two other objects.

I inhert from them and add a function with converts the object returned from
the webservice into my object which I then mess around with and pass back to
the webservice.

The problem isn't with the webservice it's with the serialization of the
classes.

Each class can be serialised if they are seperated, but when I put MY two
classes into the top extended class, the inheritence is fine (obviously) but
the serializer fails complaining that it can't create the XML document.

The structures are the same, the names are the same (apart from the element
names) so I don't get it.

There are work arounds but I wanted it to work simply so that I could just
pass back the objects.

An example of the classes are as follows

// Classes in the webservice:
[System.Xml.Serialization.XmlTypeAttribute("http://tempi.org/Test")]
class C1 {
public C2 Class2;
public C3 Class3;
public string S;
}

[System.Xml.Serialization.XmlTypeAttribute("http://tempi.org/Test")]
class C2 {
public string S;
}

[System.Xml.Serialization.XmlTypeAttribute("http://tempi.org/Test")]
class C3 {
public string S;
}

// Classes in the client application
class C_1 : C1 {
public C_1() {}
}

class C_2 : C2 {
public C_2() {}
}

public C_3: C3 {
public C_3() {}
}

I appreciate it.

Chris