LINQ for SQL Aggregates

[Shimon Sim]

I am having hard time figuring out how to reproduce following SQL in LINQ

SELECT State.Name, City.Name, COUNT(Person.PersonId)
FROM State INNER JOIN City ON State.StateId=City.StateId
INNER JOIN Person Person.CityId=City.CityId
GROUP BY State.Name, City.Name

I have few quires similar to this on with HAVING, SUM and so on.

Can some one help me with LINQ expression for this sample?
Thanks,
Shimon.