using System;

using System.Collections.Generic;

using System.Linq;

​

namespace ConsoleApplication1

{

    internal class Resident

    {

        public int Id { get; set; }

        public string Name { get; set; }

        public string City { get; set; }

    }

​

    internal class ResidentNameComparer : IEqualityComparer<Resident>

    {

        public bool Equals(Resident x, Resident y)

        {

            if (string.Equals(x.Name, y.Name, StringComparison.OrdinalIgnoreCase))

            {

                return true;

            }

            return false;

        }

​

        public int GetHashCode(Resident obj)

        {

            return obj.Name.GetHashCode();

        }

    }

​

    public class Program

    {

        public static void Main(string[] args)

        {

            List<Resident> delhiResidents = new List<Resident>();

            delhiResidents.Add(new Resident { Id = 1, Name = "Ramesh", City = "Delhi" });

            delhiResidents.Add(new Resident { Id = 2, Name = "Kapil", City = "Delhi" });

            delhiResidents.Add(new Resident { Id = 3, Name = "Vikas", City = "Delhi" });

            delhiResidents.Add(new Resident { Id = 4, Name = "Amit", City = "Delhi" });

​

            List<Resident> kolkataResidents = new List<Resident>();

            kolkataResidents.Add(new Resident { Id = 5, Name = "Kapil", City = "Kolkata" });

            kolkataResidents.Add(new Resident { Id = 6, Name = "Manmohan", City = "Kolkata" });

            kolkataResidents.Add(new Resident { Id = 7, Name = "Deepak", City = "Kolkata" });

            kolkataResidents.Add(new Resident { Id = 8, Name = "Amit", City = "Kolkata" });

​

            var onlyDelhiResidents = delhiResidents.Except(kolkataResidents, new ResidentNameComparer());

​

            Console.WriteLine("Only Delhi Residents:");

            foreach (var item in onlyDelhiResidents)

            {

                Console.WriteLine(item.Name);

            }

        }

    }

}