Using LINQ to Objects to find items in one collection that do not match another

Question

I want to find all items in one collection that do not match another collection. The collections are not of the same type, though; I want to write a lambda expression to spe

Answer 1

Managers are employees, too! So the Manager class should subclass from the Employee class (or, if you don't like that, then they should both subclass from a parent class, or make a NonManager class).

Then your problem is as simple as implementing the IEquatable interface on your Employee superclass (for GetHashCode simply return the EmployeeID) and then using this code:

var nonManagerEmployees = employeeList.Except(managerList);