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ADO.NET Programming in Visual Basic™ .NET by Bob Howell, Steve Holzner

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Multitier Application Design

This is another one of those buzzwords. What do we mean by multitier architecture and what does it have to do with the ADO .NET class library? Most of us think of a three-tier architecture or a business rules layer when we think of a multitier architecture.

Multitier architecture is an application architecture where the code is divided into logical layers and is spread over multiple software components and multiple physical machines.

Even though some consider multiple-component architecture where the code all resides on one machine as multitier, it is not. Applications written using multiple code modules and DLLs on a single machine have been around for years. They are not usually considered multitier. To be a multitier ...

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