Undo/Redo Method for Databound Objects

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

namespace RestaurantForm
{
    public delegate void HealthScoreChangedEventHandler(object sender, HealthScoreChangedEventArgs e);
    public class HealthScoreChangedEventArgs : EventArgs
    {
        private HealthScore _oldvalue;
        private String _description;
        public HealthScoreChangedEventArgs(HealthScore oldvalue, String description) { _oldvalue = oldvalue.DeepClone(); _description = description; }
        public HealthScore OldValue { get { return _oldvalue; } }
        public String Description { get { return _description; } set { _description = value; } }
    }
    [Serializable]
    public class HealthScore
    {
        private int _value;
        public event HealthScoreChangedEventHandler Changed;
        public HealthScore() { _value = 0; }
        public HealthScore(int value) { _value = value; }
        public int Value
        {
            get { return _value; }
            set { OnChanged(new HealthScoreChangedEventArgs(this, "Value: " + this.Value + " to " + value.ToString())); _value = value; }
        }
        public int ValueSilent { set { _value = value; } }
        public HealthScore DeepClone()
        {
            HealthScore clone = new HealthScore();
            clone.ValueSilent = this.Value;
            return clone;
        }
        private void OnChanged(HealthScoreChangedEventArgs e) { if (Changed != null) Changed(this, e); }
    }
}