OK, I have decided to use typed datasets in my data access layer (DAL). So, my question is, do I really need to create a business logic layer (BLL)
From what I have read, you can extend the dataset classes in the DAL using partial classes and place business logic there. Doesn't this combine the DAL and BLL into one component
Or is there something I'm missing Do you create the BLL and start by referencing the DAL project and inheriting the classes from the DAL and extend the classes there I don't get where one ends and the other starts. OR, if it really makes a difference. ...or do I even know what I'm talking about...
Background: VB 2005, Winform app, expertise level: intermediate+, small application audience, single developer.
Thanks,
Jim
Still unclear on how to use Typed Datasets in BLL...
stefanh
Nevermind... I finally found the answer. I just had to re-read it.
http://msdn2.microsoft.com/en-us/library/aa581779.aspx
Jim
beechum1
In the msdn example there are methods which return a dataTable, like mthod 'GetProducts'. You can bind such an object to a grid
Reta
If the Business layer is nothing more than extension of DL layer you can igonre it.
But if you are using lots of complex rules then I would suggest to use it logic resides in one place, cleaner to fix bugs later.
Regarding Typed dataset they are many times faster than untyped datset. I know its pain to create lots of typed dataset but in end you get speed efficency.
Cheers !!!
sam !!
JiltedCitizen
In an app I wrote using V1.1 of the framework (no support for partial classes) I had to use to approach of keeping the business logic seperate from the type dataset.
I used a pattern that is known as the TableModule pattern (by Martin Fowler).
Geert
hailstorm
Not quite-
I thought I had if figured out but then using the BLL in the UI has a new problem.
I created my DAL and BLL according to the above article. I then created a new project (for the UI) and referenced the BLL project. I then tried to bind a datagridview on my form to the class in the BLL and it doesn't show any fields.
What am I missing Is there some article somewhere on how to use BLL objects based on typed datasets in the UI
Thanks,
Jim
mimi_farah
OK, so let's assume that I would like to separate out my business logic. How do actually do that Do I create a new class library, reference the DAL project, create new classes that inherit the DAL classes Then start adding logic and validation there
Thanks for your help
Jim
JayaC