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It says in the Preface of the book:
The author has posted a comprehensive code library on the IDesign website with
more than 150 downloads related to WCF essentials, contract design, instance management, operations and calls, faults, transactions, concurrency, queuing, security, and the service bus. The downloads articulate many of the code snippets in this book in a working fashion. However, because of the large number of the downloads, the maintenance involved, and the fact that these secondary, accompanying examples do not themselves appear in the book, they are provided separately from the official sources.
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