Implementing Object Undo and Redo capabilities in .NET

using System;
using System.Collections;


namespace ClassLib
{
	/// <summary>
	/// The User class represents an actual Entity that
	/// requires undo capabilities implemented.
	/// The bulk of the undo capabilities is in the parent class
	/// </summary>
	[Serializable]
	public class User : Entity
	{
		private long mUserID;
		private string mFirstName;
		private string mLastName;

		public User()
		{
			mFirstName="";
			mLastName="";
		}
		public long UserID
		{
			get
			{
				return mUserID;
			}
			set
			{
				mUserID = value;
			}
		}

		public string FirstName
		{
			get
			{
				return mFirstName;
			}
			set
			{
				// store the undo information first
				AddHistory("FirstName",mFirstName);
				mFirstName = value;
			}
		}

		public string LastName
		{
			get
			{
				return mLastName;
			}
			set
			{
				// store the undo information first
				AddHistory("LastName",mLastName);
				mLastName = value;
			}
		}

	}
}