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3 layer architecture for ASP.net Website

Posted on 2013-11-13
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Last Modified: 2013-11-19
I am creating a ASP.net website. I want to have it in 3-layer architecture.
I have attached the image of solution explorer of my website. Can anyone suggest how my website in solution explorer should look for 3 layer architecture.
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Question by:Raj_donet
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by:käµfm³d 👽
ID: 39644955
Image?

In my experience, when you have a 3-layer architecture, you end up having one project per layer. This approach makes it easy to swap out a layer if you have to make changes in the future. For example:

Screenshot
You have a layer to interact with the database, a layer to enforce your business rules (like validation), and a layer to display information to the user. You should be able to swap out any layer without causing significant (ideally no) change in any other layer.
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Author Comment

by:Raj_donet
ID: 39645257
Mine is ASP.Net website not web application. Please see the attachment.
Untitled.png
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by:käµfm³d 👽
ID: 39645304
That is inconsequential. My comment still holds.
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Author Comment

by:Raj_donet
ID: 39645307
How can I create seperate projects in a website
It would be helful, if you can explain.
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by:käµfm³d 👽
ID: 39645578
Right-click the solution within Solution Explorer, then select Add->New Project.

Screenshot
The solution is the top-most item within the Solution Explorer. You would be adding library projects:

Screenshot
...one for each layer (except the site itself, which is your UI layer).
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Author Comment

by:Raj_donet
ID: 39647827
since they are going to be in different projects, should I include the dlls to access them?
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käµfm³d   👽 earned 2000 total points
ID: 39647856
You should "Add Reference"s to them, yes. But typically your UI layer does not know about your Data layer; it only knows about the Business layer (meaning your UI layer would only have a reference to the Business layer project). Your Business layer only knows about the Data layer; it does not know about the UI layer (meaning your Business layer would only have a reference to the Data layer project). The Data layer knows about neither the UI layer nor the Business layer, so it has no references to either project. So graphically:

UI Layer -->  Business Layer  -->  Data Layer

..where each arrow represents a reference to another project. Maintaining this practice allows you to minimize the number of dependencies (and ideally the number of changes) between projects.
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