>Thanks for your reply Michel, I've already tried that but didn't work!
>
>I'm using the Imports keyword in the declaration section so I don't have to specify the Systems.Configuration path.

Yes, this is what I assumed. What I was saying is that I tried exactly as you have and it works. I assume you have rebuilt the project once you have added the key. I can't think of anything else right now that would cause this to not work.