Want the solution of my example

Question

var z = from x in eb.trainings

            where x.IDNo.Distinct().Count() <= 1

            join y in eb.members on

            x.IDNo equals y.IDNo

            where y.Nationality == "Singaporean Citizen"

            select y.IDNo.Count();

This code is in error.. So that can anyone help me to solve my problem with only LINQ.

Thanks in advanced.