connection string for a vb.net application to be deployed in random system

I am facing problem in using vb.net with sql server as DB..Problem is of connection string i.efor 'n' no. Of systems what shall be the connection string?App after geting deployed in other system creates connection path error.what shall be coded so that connection string is defined automatically .?please share any link or explanation for the sameI am facing problem in using vb.net with sql se