What to return from the DAL to BLL

Question

I currently have an application which consists of: User Interface (web page) BLL (Manager & Domain Objects) DAL (DataAccess class for each of my Domain Objects).

I u

Answer 1

In my opinion you should never let DAL access BLL. That is an unnecessarily dependency.

Putting the Book class into a new project (perhaps named DomainModel) will fix the circular reference. You could do something like this:

Project BLL reference DAL and DomainModel

Project DAL reference DomainModel

Project UI reference BLL and DomainModel

Project DomainModel reference nothing