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Building Enterprise Applications with Windows® Presentation Foundation and the Model View ViewModel Pattern by Raffaele Garofalo

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Building a Distributed Data Layer with RIA and WCF

What you’ve seen so far is fine if your DAL is written in C# or Visual Basic .NET, and if it’s used by a “normal” .NET application that uses the common CLR, such as a WPF Client application. This means that you can write your custom and generic DAL once and reuse it repeatedly for your WPF application, for your ASP.NET application, or for a simple Windows Service application. If you are using a three-tier approach, the concept becomes more complex. This is because you will need to add an additional abstraction using a Windows Communication Foundation (WCF) or a web service technology that will provide the atomic methods to call the DAL stored at the application server level.

Unfortunately, as soon ...

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