linq group by with count

Question

Im trying to write query in linq

Select UserId, UserNumber 
FROM User
where UserNumber in
(Select UserNumber
        FROM User
        group by UserNumber
        having Count(UserId) = 1)

Aby hints ?

Answer 1

var query = from u in User
            group u by u.UserNumber into usergroup
            where usergroup.Count() == 1
            from item in usergroup
            select new { item.UserId,item.UserNumber };