Is there a “not equal” in a linq join

Question

I am trying accomplish the LINQ query below but I need a \"not equal\" instead of equal, so that filteredEmployees has all employees from groupA minus groupB.

Answer 1

use of this code for decreased server cost :

The code works very fast compared to other code

        var noExistList = (from n in groupA 
                                join o in groupA  on n.Id equals o.Id into p
                                where p.Count() == 0
                                select n).ToList();

note: groupA is a new list for add.