howto define DataSets namespaces in App_Code directory (ASP .NET 2

[Guest]

I have a very large web project converted from ASP 1.1 to 2.0
I my App_Code folder have two subfolders: Orders and Customers (in the real
environment I have more folders)
inside each folder there are several classes (.cs) define in two different
namespaces:
All the classes in the Orders folder have a namespace called MyProject.Orders
All the classes in the Customers folder have a namespace called
yProject.Customers

The question is:
How can I add a strong named DataSet (xsd file) to one of the two subfolders
and define its default namespace?
Can't I have multiple DataSet with the same name stored in different
subfolders of the App_Code directory?

Thanks in advance
Marco Roello