Does in 3 tier architecture DAL,BLL and the UI has to be in separate systems

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Hey guys ,

I have this doubt relating to 3 tier architecture. I have developed an application and
its having 3 projects in it an asp.net project and two class libraries (BLL,DAL).
BLL is using direct reference(adding reference to the DLL) from DAL and UI is using direct reference from the BI.
When I am hosting , I am placing this all on one server and DB is on another server.
So can my application be refereed as 3 tier or is it 3 Layer?

Also how can I reference these DLL (DAL and BLL) if they are placed on a separate machine? Or Should they be web services?

Thanks in advance!!

Posted 7-Jun-15 23:31pm

sreesankar89

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Kornfeld Eliyahu Peter · Answer 1 · 2015-06-07T23:56:00

Solution 2

You have to learn the difference between tier and layer...
DAL, UI and so are layers and representing logical separation of the system you designed
Tier on the other hand is about physical separation of the different logical parts of the system...

Posted 7-Jun-15 23:56pm

Kornfeld Eliyahu Peter

Comments

sreesankar89 8-Jun-15 6:07am

Ya thats what i am asking?
I am trying to achieve the physical separation by keeping them in separate class library.
But still they are deployed in a single pc. Can I deploy these Dlls (DAL and BLL) as such on to separate server machine. How this is achieved?
How to construct a 3 tier architecture then?

Kornfeld Eliyahu Peter 8-Jun-15 6:28am

If you don't know how to distribute your components (means you do not know how to call some method over the network) you have to pick some books...It's an answer can not be given here - simply too long...
You may start here: http://www.codeproject.com/Reference/617/Useful-Reference-Books

Sergey Alexandrovich Kryukov 8-Jun-15 13:18pm

That's the point, a 5.
—SA

Kornfeld Eliyahu Peter 8-Jun-15 16:00pm

Thank you...

Simon_Whale · Answer 2 · 2015-06-07T23:47:00

Solution 1

You are designing what is called a Layered application if it is on the same installation \ machine.

further reading Chapter 5: Layered Application Guidelines[^]

Posted 7-Jun-15 23:47pm

Simon_Whale

Comments

sreesankar89 8-Jun-15 6:08am

How to construct a Tier architecture?
how do these tier communicate?

Simon_Whale 8-Jun-15 9:29am

have a read of this https://code.msdn.microsoft.com/ASPNET-N-Tier-WCF-sample-f97ea025

Wastedtalent 9-Jun-15 8:16am

A very simple approach may be to have each layer in a separate project.

Each layer then provides an interface and an implementation of the interface that the next layer can consume.

The above links will explain in more detail.