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I have a question to which someone may have found a solution in the past. I'm seeding the database in the Configuration class of EF5 migrations, using the AddOrUpdate method. Here's the quick example of the domain model: public class Club { public virtual long Id { get; set; } public virtual string Name { get; set; } } public class Court { public virtual long Id { get; set; } public virtual string Name { get; set; } public virtual long? ClubId { get; set; } public virtual Club Club { get; set; } } Then here is an extract from my seed method: Club cb = new Club { Name = "Test Club 1" }; context.Set<Club>().AddOrUpdate(m=>m.Name, cb); context.SaveChanges(); Court crt1 = new Court { ClubId = cb.Id, Name = "Court 1" }; Court crt2 = new Court { ClubId = cb.Id, Name = "Court 2" }; context.Set<Court>().AddOrUpdate(m => new { m.Name, m.ClubId }, crt1, crt2); context.SaveChanges(); Now, once the code reaches line number 7, it throws an error: The binary operator Equal is not defined for the types 'System.Nullable`1[System.Int64]' and 'System.Int64'. From my investigation it's due to the fact that ClubId is a Nullable long. Is there any way around this? Not a major issue - I'm just a perfectionist, and would like to see how others may have solved this... Thanks, Nick Goloborodko

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