http://www.codeproject.com/gen/design/DudeWheresMyBusinessLogic.asp
That will help you understand the issue.
He may go a little overboard with the "it has to be simple Select Insert
Update and Delete statements", but the article is good.
Presentation
Biz
DataLayer
A couple of rules (imho)
The DataLayer returns
DataSets,
IDataReaders,
Scalars (values like the count of employees in the database or number of
affected rows)
void (nothing, the code just ran ok)
The biz layer talks to the datalayer.
The presentation layer talks to the biz layer.
The presentation layer DOES NOT TALK to the datalayer.
You put business rules in the biz layer. Sounds simple, but alot of people
miss it.
If an emp needs to have a date of birth before some date, it goes in teh biz
layer.
Don't put it in the presentation layer.
...
well tiered development isn't something you learn overnight, but you'll
never get it if you don't try.
Good luck.!
