How do I assign EntityCollection property to another property?

I have a type that is derived from an Entity generated by the Entity Framework 3. How do I assign one Customer's Order property to the Derived Customer's Order property?

derivedCustomer.Orde开发者_JAVA技巧rs = customer.Orders

I'm not actually trying to swap orders; this is just an example of what I am trying to achieve. Has anyone done tried this and succeed?

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Loop through each record and add to the other collection:

foreach (var order in customer.Orders)
   derivedCustomer.Orders.Add(order);

You could make an extension method to make that seamless too.