QueryOverExamples.cs

// With Count
var count = sess.QueryOver<ITicket>()
                .Where(x => (x.SentBundle == false || x.SentBundle == null)
                            && x.ScheduledDate >= startDate && x.ScheduledDate <= endDate &&
                            (string)x.Contact.Id == (string)contact.Id)
                .Select(Projections.Count("Id"))
                .SingleOrDefault<int>();