My project (UI layer is asp.mvc) was developed using .NET 3.5. After upgrading to .NET 4.0 I have got problem with compiled queries: [ArgumentException: Query was compiled for a different mapping...

Sometimes, not always, I'm getting following error: "The underlying provider failed on open." This is my situation: I have a list of integer keys I process in parallel to be used as parameter in ...

I thought that compiled queries would perform the same query translation as DataContext. Yet I'm getting a run-time error when I try to use a query with a .Contains method call. Where have I gone w...