Memento Design Pattern Example

Backup.cs

using System;
using System.Collections.Generic;
using System.Linq;

namespace MementoPattern
{
    //Originator class
    public class Backup
    {
        public string BackupName { get; set; }
        public DateTime BackupDate { get; set; }
        public Backup(string name, DateTime date)
        {
            BackupName = name;
            BackupDate = date;
        }
        public Memento CreateBackup()
        {
            Memento m = new Memento();
            m.SetBackup(BackupName, BackupDate);
            return m;
        }
        public void RestoreBackup(Memento m)
        {
            Backup b = m.RestoreBackup();
            BackupName = b.BackupName;
            BackupDate = b.BackupDate;
        }
        public override string ToString()
        {
            return string.Format("Backup Name - {0}, Date - {1}", BackupName, BackupDate.ToString("dd-MM-yyyy"));
        }
    }
}

BackupManager.cs

using System;
using System.Collections.Generic;
using System.Linq;

namespace MementoPattern
{
    //caretaker class
    public class BackupManager
    {
        List<Memento> mementoList = new List<Memento>();

        public void CreateBackup(Backup b)
        {
            Console.WriteLine("{0} created.", b.BackupName);
            mementoList.Add(b.CreateBackup());
        }
        public void RestoreBackup(string backupName, Backup b)
        {
            b.RestoreBackup(mementoList.Find(x => x.b.BackupName.Equals(backupName)));
            Console.WriteLine("{0} restored.", b.BackupName);
        }
        public void ListAllBackups()
        {
            Console.WriteLine("\nBackups available for restore - {0}\n", string.Concat(mementoList.Select(x => x.b.BackupName.ToString() + ",")));
        }
    }
}

Memento.cs

using System;
using System.Collections.Generic;
using System.Linq;

namespace MementoPattern
{
    //Memento class
    public class Memento
    {
        public Backup b;

        public void SetBackup(string name, DateTime date)
        {
            b = new Backup(name, date);
        }
        public Backup RestoreBackup()
        {
            return b;
        }
    }
}

Program.cs

using System;
using System.Collections.Generic;
using System.Linq;

namespace MementoPattern
{
    class Program
    {
        //Client entry point
        static void Main(string[] args)
        {
            BackupManager bm = new BackupManager();

            Backup b = new Backup("Backup1", DateTime.Now.AddDays(-10));
            Console.WriteLine(b.ToString());
            bm.CreateBackup(b);

            Backup b1 = new Backup("Backup2", DateTime.Now.AddDays(-8));
            Console.WriteLine(b1.ToString());
            bm.CreateBackup(b1);

            Backup b2 = new Backup("Backup3", DateTime.Now.AddDays(-5));
            Console.WriteLine(b2.ToString());
            bm.CreateBackup(b2);

            Backup b3 = new Backup("Backup4", DateTime.Now.AddDays(-2));
            Console.WriteLine(b3.ToString());
            bm.CreateBackup(b3);

            bm.ListAllBackups();

            bm.RestoreBackup("Backup2",b);
            Console.WriteLine(b.ToString());

            bm.RestoreBackup("Backup1", b2);
            Console.WriteLine(b2.ToString());

            Console.Read();
        }
    }
}