Connecting to a web service with SilverLight

I have been looking online for a simple way to call a web service through silverlight application and cant decide how to do it. What would be the simplest way to connect to this website: http://wsf.cdyne.com/WeatherWS/Weather.asmx and return an xml with the specified zip code (I have this done using AJAX already i just want to try and get it working using silverlight as an alternative). Any help