Where i have to create data access layer (ado.net) in MVC c#, i am not using entity framework

i am not using Entity framework, then where i have to create data access layer in mvc(c#) Architecture. if i am creating data access layer library outside of MVC project then what is benefit of MVC architecture.like

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MVC_project- Dallibrary- BAL library-

unit test project-

Please help for accommodate DAL layer in MVC itself.