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Select model layers or BLL / DAL / BO?

I’m wondering about one thing: is it better to place all business objects and adapters in the Model folder or create 3 layers (BLL / DAL / BO) instead of the Model folder?

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If you follow the principle of shared responsibility , which states that a class must change for only one reason, the answer will be clear:

create 3 layers (BLL / DAL / BO)

As for the placement - for organizational reasons, I would create a different folder for each layer.

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I prefer to create a class library with all the data access code, and then reference it in an MVC application or using dependency injection.

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