Implementing the Observer Pattern

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

namespace ObserverTutorial.App_Code
{
    [Serializable]
    public class AddressEntity
    {
        public AddressEntity()
        {
            this.EntityID = 0;
            this.CountryName = String.Empty;
            this.CityName = String.Empty;
            this.PostalCode = String.Empty;
            this.Buliding = String.Empty;
            this.Street = String.Empty;
            this.State = String.Empty;

            this.CreatedBy = String.Empty;
            this.CreationDate = new DateTime();
            this.LastModificationDate = new DateTime();
            this.LastModifiedBy = String.Empty;
            this.Status = String.Empty;

        }

        String m_CountryName;
        public String CountryName
        {
            get { return m_CountryName; }
            set { m_CountryName = value; }
        }

        String m_CityName;
        public String CityName
        {
            get { return m_CityName; }
            set { m_CityName = value; }
        }

        String m_PostalCode;
        public String PostalCode
        {
            get { return m_PostalCode; }
            set { m_PostalCode = value; }
        }

        String m_Buliding;
        public String Buliding
        {
            get { return m_Buliding; }
            set { m_Buliding = value; }
        }

        String m_Street;
        public String Street
        {
            get { return m_Street; }
            set { m_Street = value; }
        }

        String m_State;
        public String State
        {
            get { return m_State; }
            set { m_State = value; }
        }

        #region "Entity Details"

        DateTime m_CreationDate;
        public DateTime CreationDate
        {
            get { return m_CreationDate; }
            set { m_CreationDate = value; }
        }

        DateTime m_LastModificationDate;
        public DateTime LastModificationDate
        {
            get { return m_LastModificationDate; }
            set { m_LastModificationDate = value; }
        }

        String m_CreatedBy;
        public String CreatedBy
        {
            get { return m_CreatedBy; }
            set { m_CreatedBy = value; }
        }

        String m_LastModifiedBy;
        public String LastModifiedBy
        {
            get { return m_LastModifiedBy; }
            set { m_LastModifiedBy = value; }
        }

        String m_Status;
        public String Status
        {
            get { return m_Status; }
            set { m_Status = value; }
        }

        int m_EntityID;
        public int EntityID
        {
            get { return m_EntityID; }
            set { m_EntityID = value; }
        }

        # endregion

    }
}