how to give database path dynamically when creating setup of a windows app.

Hi,
,  I have developed a window app with ms access database. and created setup. Now when i want to install that in my client system, I have to provide a facility to client. that is, if client wants to change the database path, he will change. For that I have to provide option. How to give it, How to change the connection string in app.config after creating the setup file.


Thanks & Regards
   Happy.