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By default EDMs created in Visual Studio 2012 generates simple POCO entity classes and a context that derives from and if you for some reason need the granular control of the latter you can implement an extension method – extension methods enable you to “add” methods to existing types without creating a new derived type – to be able to convert the A repository is responsible for encapsulating the data access code.

It sits between the DAL and the business layer of the application to query the data source for data and map this data to an entity class, and it also persists changes in the entity classes back to the data source using the context.

By right-click on the template file and choose “Run Custom Tool” the entity classes will be regenerated to reflect the latest changes to the model. As the context by default expects the entity classes to be in the same namespace, add a using statement for their new namespace to the Model. Finally, you need to add a reference from the DAL project to the domain model project in order for it to compile.whether the DAL uses EF, another ORM or manually creating connections and commands to execute queries against a data source. For EF to enable features such as lazy loading and automatic change tracking for POCO entities, it can create a wrapper class around the POCO entity at runtime.Besides the abstraction it brings it’s also great if you are using dependency injection in your application. There is a certain set of rules that your entity classes need to follow to get this proxy behavior.Typically when you are doing database first development using EF you are targeting an already existing database but for testing and demo purposes you may of course generate a new one from scratch.There is a walkthrough on how you can create a local service-based database in Visual Studio 2012 available on MSDN here.

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