Linq on datatable and list<objects> giving wrong result

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LINQ

C#3.5

DataTable

I have datatable , I need to enumerate it and check against the List objects and take the matching rows from the datatable. But for some reason below returning all the datarows even though it's not matching.

What I have tried:

var joinForUpdate = 
    from rowA in ds.Tables[0].AsEnumerable()
    where fin.Select(y => rowA.Field<int>("B") == y.BID&& y.AID== rowA.Field<int>("A")).Any()
    select rowA;