I’m afraid you’ve indeed seen overly simplified examples. LINQ to SQL (System.Data.Linq) is your DAL layer. The classes L2S generates is your domain (but not to confuse with Domain-Driven Design). On top of that you can still write your Business Layer. I always try to prevent leaking the LINQ to SQL DataContext into the presentation … Read more
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
They’re pretty much the same, however in 3-Tier, the top level (presentation) never directly communicates with the bottom layer (data persistence). In model-view-controller, theoretically the Model is supposed to ‘notify’ the View that it has changed so that the View can update. However, this is usually not an issue in most web applications because they … Read more
The problem with the sample above is that it is terribly slow. I have a DataTable with about 400 rows and this conversion takes a good 5 or 6 seconds! It does seem like a pretty common task, so I’m surprised to not see someone here with a more performant solution. * Update!! * Just … Read more
Short answer: No. Long answer: repository is responsible for turning persisted data back to entities (models) and vice versa. Model is a business Model representing a business entity. DTO on the other hand – while looks like Model – is concerned with transfer of the object between various environment and in essence is a transient … Read more
N-tier architecture usually has each layer separated by the network. I.E. the presentation layer is on some web servers, then that talks to backend app servers over the network for business logic, then that talks to a database server, again over the network, and maybe the app server also calls out to some remote services … Read more
My approach might not be ideal, but I find it working quite well. Thing what I did – I decided not to use dependency injection pass current user everywhere directly because that was getting too cumbersome and switched to static context. Problem with contexts – they are a bit difficult to manage. This one is … Read more
Wikipedia: In software engineering, multi-tier architecture (often referred to as n-tier architecture) is a client-server architecture in which, the presentation, the application processing and the data management are logically separate processes. For example, an application that uses middleware to service data requests between a user and a database employs multi-tier architecture. The most widespread use … Read more