Data Layer

OK first of all, I'm new in designning a 3 tier application.
For now this I what I have. I got a data layer that representing my whole DB. I know that the purpose of having the data layer is just to access and manipulate data in DB.

I add a form to my project and I want to populate and display the data as similiar as data enviroment do. Can I use the data layer to populate and display the data in a text box? or is it impossible?
what should I put for the:
datasource
datamember
datalist