How to use not equal in joining of LINQ

Question

var h = (from l in EntityBroker.getEntity().trainings

group l by new { l.IDNo } into z

where z.Where(y => y.IDNo == z.Key.IDNo).Count() >= 1

join n in EntityBroker.getEntity().members on "Singapore Citizen" equals  n.Nationality

select new { Idnumber = z.Key.IDNo });

You will see my example code... In this code I want to use ' not equal ' instead of equals.

Please don't say like "!="...... It cannot use in this statement. 

 

Thanks a lot for viewing my question and give me the correct answer. :-)