using System;

using System.Linq;

using System.Collections.Generic;

​

public class Program

{

    public void Main()

    {

        var List1 = new List<Employee>{new Employee{EmployeeId = "A9", Firstname = "George", Lastname = "Lucas", Employmentstatus = "Active"}, new Employee{EmployeeId = "A2", Firstname = "Sam", Lastname = "Tri", Employmentstatus = "Active"}, new Employee{EmployeeId = "A3", Firstname = "Alex", Lastname = "Smith", Employmentstatus = "Active"}, new Employee{EmployeeId = "A4", Firstname = "Walter", Lastname = "Anderson", Employmentstatus = "Active"}, new Employee{EmployeeId = "A5", Firstname = "Monte", Lastname = "Lexington", Employmentstatus = "Active"}, new Employee{EmployeeId = "A6", Firstname = "Frank", Lastname = "Smith", Employmentstatus = "Suspended"}, };

        var List2 = new List<Employee>{new Employee{EmployeeId = "A1", Firstname = "George", Lastname = "Lucas", Employmentstatus = "Active"}, new Employee{EmployeeId = "A2", Firstname = "Sam", Lastname = "Tri", Employmentstatus = "Terminated"}, new Employee{EmployeeId = "A3", Firstname = "Alex", Lastname = "Smith", Employmentstatus = "Active"}, new Employee{EmployeeId = "A4", Firstname = "Sam", Lastname = "Anderson", Employmentstatus = "Active"}, new Employee{EmployeeId = "A5", Firstname = "Monte", Lastname = "Lexington", Employmentstatus = "Active"}, new Employee{EmployeeId = "A6", Firstname = "Frank", Lastname = "Smith", Employmentstatus = "Retired"}, new Employee{EmployeeId = "A7", Firstname = "Lex", Lastname = "Fama", Employmentstatus = "New"}, };

        // EmployeeID is changed from A1 to A9 (George Lucas), but he doe not return in the results where EmployeeIDs A2, A4, A6 and A7 all have property changes.

        var results = List2.Except(List1, new EmployeeComparer()).ToList();

        results.Dump();

    }

​

    public class Employee

    {

        public string EmployeeId

        {

            get;

            set;

        }

​

        public string Firstname

        {

            get;

            set;

        }

​

        public string Lastname

        {

            get;

            set;

        }

​

        public string Employmentstatus

        {

            get;

            set;

        }

    }

​

    public class EmployeeComparer : IEqualityComparer<Employee>

    {

        public int GetHashCode(Employee co)

        {

            if (co == null)

            {

                return 0;

            }

​

            //You can use any property you want (other than EmployeeID for your purposes); the GetHashCode metho is used to generate an address to where the object is stored

            return co.Employmentstatus.GetHashCode();

        }

​

        public bool Equals(Employee x1, Employee x2)

        {

            if (object.ReferenceEquals(x1, x2))

            {

                return true;

            }

​

            if (object.ReferenceEquals(x1, null) || object.ReferenceEquals(x2, null))

            {

                return false;

            }

            return x1.Employmentstatus == x2.Employmentstatus && x1.Firstname == x2.Firstname && x1.Lastname == x2.Lastname;

        }

    }

// Define other methods and classes here

}