I have two web services added to the project. One is real web service. Other one is test webservice. i have used them to set some parameters.

eg: WS.OrderDescription 
    WS.Amount
    WS.OrderNumber
    etc

I want to change this WS and WS-test interchagebly. For that i want to add this two into config and access what ever i want (WS or WS-test) by chaging the value in config. How to add this webservice references to config and access in code.