LINQ select nullable Id

[Greg Keogh]

Folks, I want to select the int Id of an entity in a DbSet, or int? null if
it's not found. Like this *wrong* sample:

int? id = (from t in things where t.Name == "Foo" select
t.Id).FirstOrDefault();

In this case I get int zero if there is no match but I want null. Is there
some way of rearranging this to get an Id or null? Remember that the query
has to convertible down to SQL.

Greg K