Why overload true and false instead of defining bool operator?

Question

I\'ve been reading about overloading true and false in C#, and I think I understand the basic difference between this and defining a bool operator. The example I see around is

Answer 1

I've seen people overload the true and false overloads in order to do clever things like building expressions in .NET 2.0, before Linq existed.

Ayende worked out a syntax like this to build NHibernate criteria queries, using his NHQG project:

return Repository.FindAll(
    (Where.Publisher.Name == name) &&
    (Where.Publisher.City == city));