a 3 tier Architecture is composed by 3 Main Layers PL Presentation Layer BLL Business Logic Layer DAL Data Access Layer each top layer only asks the below layer and never sees anything on top of it. When They ask you about How will you build your BLL, you can write something like: namespace Company.BLL … Read more
When you define an entity in the EDMX model you can specify the visibility of each property’s setter and getter, so if you don’t want the ModifiedDate to be visible in other layers, you can simply specify it as internal. If your requirements are more complicated like the ModifiedDate should be accessible in the entities … Read more
It seems like you are asking about the difference between the data model and the domain model – the latter is where you can find the business logic and entities as perceived by your end user, the former is where you actually store your data. Furthermore, I’ve interpreted the 3rd part of your question as: how … Read more