On this episode, Dinesh Kulkarni shares his top tips for creating streamlined and performant WCF RIA Services applications. He walks through some key decision points while creating domain services (server side) for a Silverlight and RIA Services application. Among the tips Dinesh discusses are some of the benefits of creating the minimal number of entities, operations, and amount of data required for your application. He also discusses how to connect RIA Services to: Entity Framework LINQ to SQL nHibernate Your own custom business objects Other topics Dinesh walks step-by-step through include: hooking RIA Services up to your own POCO classes adding role-based authorization how to determine what objects will be exposed by RIA Services to the client adding validation identifying keys and associations for entities indicating when to return object graphs how to use the Composite attribute to bundle objects graphs This is a great deep dive by one of the masterminds behind WCF RIA Services.  Relevant links: John’s blog and on Twitter (@john_papa) Nhibernate and RIA Services sample  PDC 2009 talk using same nhibernate sample: Mastering WCF RIA Services Dinesh's blog and on Twitter (@di_Ku) Follow us on Twitter @SilverlightTV or on the web at     Are you developing with Windows Phone 7? You can pre-order Learning Windows Phone Programming today, by Jaime Rodriguez, Yochay Kiriaty and John Papa! Or check out the book's web site.