如何使用c＃3.0为访问数据库设计包装器？

i have only very limited exposure with .net 1.1 and a bit of 2.0, so i'm actually pretty excited and confused with the many changes that they have in .net 3.5. so i have this access database but we don't want the other programs from calling into this database directly. so i'm writing a wrapper exe which will contains functions which can be call by the other program to return data (ala web service style).i have only very limited exposure with .net 1.1