webservice class inherite DataSet and client generate the force dataset issues

[miller chen]

Using WebServices, and server add the new class PersonSet that inherite
DataSet,follow down:

public class PersonSet:DataSet
{
private string _strB;

public string strB
{
get
{
return _strB;
}
set
{
_strB=value;
}

}
public PersonSet()
{
//
// TODO: constructor
//
}
}
this is a webservice that use the personset:
webservies:wsTest.asmx
[WebMethod]
public PersonSet GetPerson()
{
PersonSet a=new PersonSet();
return a;
}

In the client, add the web reference and auto-generate the force dataset:
NewDataSet.xsd.
but the client cann't use the PersonSet's property. Would tell me the
advantage or benifit that use the force dataset if the server inherite the
DataSet?

Miller