WCF DataContracts and underlying data structures

Question

I am wondering what makes sense in relation to what objects to expose through a WCF service - should I add WCF Serialization specifications to my business entities or should I i

Answer 1

Something to also consider, I agree with the separation but it usually winds up leading to "Translators" or some such code to copy the data from the DTO to the Business Entity. This is where a library like AutoMapper (http://automapper.org/) comes in REAL handy and does away with the need to write the translation layer.