data access layer for microsoft access databases - part 1 this multi installment article will provide instructions and source code you can use to create a data access layer (dal) for microsoft access databases. Along the way the article will explain when a dal may be appropriate and some of the roles ado.net and visual studio data technologies can play in a dal. This first installment provides instructions and a downloadable example that can be used to create a basic class library (dll) that will be extended in future installments to become a data access layer for microsoft access databases. read article...