Creating Dynamic Web.config

Hello Everybody

Iam going to deploy my Application on server but instead of specifying connection string (servername .server userid , password) in web.config manually is their any way of entering the server details in the web.confi file dynamically from client side when i first run the application.

in the starting page the user must specify the server details and database name from which  he want the data to be loaded .

And once i enter the server details it should bepermanently stored in the web.config file instead of dataabse.

so can u plz help me in finding a solution to it.