How to get around “Internal .NET Framework Data Provider error 1025.”?

Question

I am using the Entity Framework 4.3, POCO, database first and I am getting the following error:

Internal .NET Framework Data Provider error 1025.

Answer 1

I have worked out a solution to this, in case anyone is interested. Doing the following is equivalent and does not result in the exception in the question:

var res = ctx
    .Bs
    .GroupBy(b => b.A)
    .Where(g => g.All(b => names.Contains(b.SomeName)))
    .Select(g => g.Key);

I do not know if this is the best way though!?