SQL connection in the app.config file?

After the load is connected to the variable string "connectionString", Question of the standard functions of C # can be taken out each piece as: [Server = localhost] and [Port = 5432] and ... [CommandTimeout = 10], to give them form into log form as SQL Server Management Studio 2005 from here Modifying, update, add delete, ... and after the break will be saved to the app.config file