improve my => 'code' 
While using Visual Studio 2008, I made the mistake today of dropping and re-adding a WCF service reference. If you do this, not all of the service operations and exposed proxy types are recreated in the References.cs file.
If you made my mistake, cleaning the solution (right click on the solution and choose -> Clean Solution) will clear out the problem.
And in the future, I will be updating service references instead.
Hope this helps you out!
Jonathan