IT_Techno 0 Light Poster

I added a DataBase.accdb file into a project (VS 2010) then created a DataSet. but now I've a small problem:

I want to have the connection string in the app.config file, to allow customer to edit it. I go to the app.config file and find no connection string created inside. how can i make dataset create connection string automaticaly inside app.config file then always use it.

why connection string for *.accdb donot have db password and user name in it auto???