Create an Appliction which access to a database

How to make an application in C# with a access to a database (MS Access), when you let the user select the install part of the application. For example the user could choose to install my applictaion on C:\program files\My Application or on D:\Program\My Application or somewhere else. So in some way you have to make my Application recognize where I install the application so it could find my database wich is coming with the application. Anyone who could explain how to do this? thanks Daniel