http://developers.de/blogs/damir_dobric/archive/2008/06/27/linq-and-canonical-function-problem.aspxIf you run the code below, following error appear: The 'Invoke' LINQ expression node type is not supported by LINQ to Entities. The problem is that Entity Framework does not provide mapping of same expression like method invocation. This postenCommunityServer 2008 SP1 (Build: 30619.63)