Whenever I try to make use of the following LINQ to SQL functions in VS 2010 [Version 10.0.40219.1 SP1 Rel]:

I receive the following error message:

I uninstalled VS 2010 as well as VS 2010 SP1. Then I installed VS2010 & SP1 again – this did not solve the problem!
Could anyone please assist me in this matter?
Many thanks in advance!
Kind regards,
Just an FYI: this solved my issue
http://social.msdn.microsoft.com/Forums/en-US/linqtosql/thread/78537f25-6c45-4b56-b476-992e7fe8b4bf