A: 

You just need to build the project...

Thomas Levesque
+2  A: 

It is important to always rebuild your project or solution after creating (or modifying) your Linq Context Object. The code for those data classes is actually generated at build-time, so it does not exist until you do so. This catches a lot of people, so don't feel bad about asking this one :)

JoshJordan
Thanks for the solution + an explanation :D
Anders