+3  A: 

To use LINQ or .NET 3.5 feature you need to first configure the SharePoint to run in 3.5 Mode. Refer to these links on how to do that

Simplest way

AnotherOne

Kusek  2009-08-05 17:35:27
this has not worked for me yet, I get a server error in '/' Application. I am going to try to work this out. Thanks for the base to narrow my searching down :D
Anders  2009-08-05 18:59:14
Enabled the CallStack="True" and CUstomError="Off" in Web.Config, you will get to know the actual error .
Kusek  2009-08-06 03:44:15
the real problem was I forgot to install .net 3.5 on my server >.<. haha. thanks for the input though :)
Anders  2009-08-06 16:42:11

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