Thanks Bonnie,
I have another question. I am following your advise and I have a 3-tier solutions: UI, Business and Dataaccess layer.

Now on my form I instantiate my biz onject to get a dataset.
Let say on this form I change some information. How do I save the changes back to my Sql Server?.

In my form do I call a method from my Dataaccess layer to save the data?.

Do you have a simple good example?.

Thanks