The Middle Tiers: Domain, Service, and generic Repository Pattern.

In order to be predictable and give yourself the maximum amount of time to develop software for the client, having a solid infrastructure that is repeatable easy to build and maintain will get you there. To get started see how my teams are using a generic repository project/template, Unit Of Work, Entity Frameworks, and some guidelines for building a service tier, and how and when to build Domain models. All of this using .Net C# code with examples and discussion.