using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public class toto

    {

        public string str { get; set; }

        public DateTime date { get; set; }

​

    }

    class totoComparer : IEqualityComparer<toto>

    {

        public bool Equals(toto b1, toto b2)

        {

            if (b2 == null && b1 == null)

            {

                return true;

            }

            else if (b1 == null || b2 == null)

            {

                return false;

            }

            else if (b1.str == b2.str && b1.date == b2.date)

            {

                return true;

            }

            else

            {

                return false;

            }

        }

​

        public int GetHashCode(toto t)

        {

            unchecked

            {

                int hash = 13;

                hash = (hash * 7) + t.str.GetHashCode();

                hash = (hash * 7) + t.date.GetHashCode();

​

                return hash;

            }

        }

    }

​

    public static void Main()

    {  

        var @old = new List<toto> {

            new toto{ str= "EXist", date= DateTime.Today },

            new toto{ str= "NotExist", date= DateTime.Today },

            new toto{ str= "ExistButOld", date= DateTime.Today },

        };

​

        var @new = new List<toto> {

            new toto{ str= "EXist", date= DateTime.Today },

            new toto{ str= "NotExist2", date= DateTime.Today },

            new toto{ str= "ExistButOld", date= DateTime.Today.AddDays(2) }

        };

​

​

        var created = @new.Except(@old, new totoComparer()).ToList();

        var deleted = @old.Except(@new, new totoComparer()).ToList();

​

​

        Console.WriteLine("\ncreated");     

        created.Dump();

​

        Console.WriteLine("\ndeleted"); 

        deleted.Dump();

    }

}