using System;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        var rc1 = new List<RC>();

        rc1.Add(new RC{Code = "001", Description = "D001"});

        rc1.Add(new RC{Code = "002", Description = "D002"});

        rc1.Add(new RC{Code = "003", Description = "D003"});

        rc1.Add(new RC{Code = "005", Description = "D005"});

        var rc2 = new List<RC>();

        rc2.Add(new RC{Code = "003", Description = "D003"});

        rc2.Add(new RC{Code = "004", Description = "D004"});

        var rc4 = 

            from r2 in rc2 where !(from r1 in rc1 select r1.Code).Contains(r2.Code) select r2;

        foreach (var r in rc4)

        {

            Console.WriteLine("Removed " + r.Code);

        };

        var rc5 = 

            from r1 in rc1 where !(from r2 in rc2 select r2.Code).Contains(r1.Code) select r1;

        foreach (var r in rc5)

        {

            Console.WriteLine("Added " + r.Code);

        };

    }

}

​

public class RC

{

    public string Code

    {

        get;

        set;

    }

​

    public string Description

    {

        get;

        set;

    }

}