The null value cannot be assigned to a member with type System.Int64 which is a non-nullable value type?

It has taken a while but I have discovered this was happening and thought I'd share. It was because the table had a trigger on insert. I've wrote about it in more detail here optimistic concurrency exception with triggers .

Although this is with entity framework, I'm still sure it is the trigger causing my dismay from the start.

The value types you have defined in your Result class need to be setup as nullable.

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