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The recommendation is that you place all of your database logic in a separate repository layer.

For example, Listing 1 contains a simple repository named the Product Repository.

In that case, where do you put your validation logic? For example, the product service layer in Listing 3 has a Create Product() method. Listing 4 - Controllers\Product Notice that the product service is created in the product controller constructor.The product repository contains all of the data access code for the application.The listing also includes the IProduct Repository interface that the product repository implements.We should find a way to remove the dependency on ASP. In Listing 5, the service layer has been updated so that it no longer uses model state.Instead, it uses any class that implements the IValidation Dictionary interface.