I'm having a tad of trouble with a couple of WCF services I've built, and it's with LINQ. Having written the service, which uses LINQ to SQL classes, I am now trying to test it. Now the Service builds perfectly, but Whenever I try to use any of its functions, I get a null pointer exception. This occurs the moment I try to instantiate my DataContext. Does anyone have any idea why this might be going on? Any help?