In this recipe, we will be creating a library which ensures that the queries which will be executed in the database are limited to the data access layer. It limits the queries by creating a clear boundary beyond which
IQueryable<T> is not exposed, only allowing access to the business layer to an
IEnumerable<T>. This ensures that the business layer cannot modify the queries in such a way as to make them non-performant, while still giving them complete access to the data.
We will be using the NuGet package manager to install the Entity Framework 4.1 assemblies.
The package installer can be found at http://nuget.org.
We will also be using a database for connecting to and updating data.
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