ASP.NET

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

namespace DuryHouse.Repository.BusinessLayer
{
    public class Room
    {
        public int _id = -1;
        public int _bed = -1;
        public int _floor = -1;
        public string _roomName = string.Empty;
        public string _type = string.Empty;

        [DataObjectFieldAttribute(true, true, false)]
        public int Id
        {
            set { _id = value; }
            get { return _id; }
        }

        public int Bed
        {
            set { _bed = value;
            if (value > 10)
            { throw new ArgumentException(string.Format("Maximum bed is 10!!!")); }
            }
            get { return _bed; }
        }

        public int Floor
        {
            set { _floor = value; }
            get { return _floor; }
        }

        public string RoomName
        {
            set { _roomName = value; }
            get { return _roomName; }
        }

        public string Type
        {
            set { _type = value; }
            get { return _typeass; }
        }

        public Room(int id, int bed, int floor, string roomName, string type)
        {
            this._id = id;
            this._bed = bed;
            this._floor = floor;
            this._roomName = roomName;
            this._type = type;
        }


    }
}

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

namespace DuryHouse.Repository.BusinessLayer
{
    public class People
    {
        protected int _id = -1;
        protected string _name = string.Empty;
        protected string _passportNumber = string.Empty;
        protected string _naionality = string.Empty;


        [DataObjectFieldAttribute(true, true, false)]
        public int Id
        {
            set { _id = value; }
            get { return _id; }
        }

        public int Name
        {
            set { _name = value; }
            get { return _name; }
        }

        public int PassportNumber
        {
            set { _passportNumber = value; }
            get { return _passportNumber; }
        }

        public int Nationality
        {
            set { _naionality = value; }
            get { return _naionality; }
        }



        public People(int id, string name, string passportNumber, string nationality)
        {
            this._id = id;
            this._name = name;
            this._passportNumber = passportNumber;
            this._naionality = nationality;
        }

        public People()
        {
        }

  

    }
}

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

namespace DuryHouse.Repository.BusinessLayer
{
    public class Korea:People
    {
        public string _city = string.Empty;
        public string _state = string.Empty;
        public string _street = string.Empty;
        public string _phone = string.Empty;
        public string _mobile = string.Empty;
        public string _email = string.Empty;


        public string City
        {
            set { _city = value; }
            get { return _city; }
        }
        public string State
        {
            set { _state = value; }
            get { return _state; }
        }
        public string Street
        {
            set { _street = value; }
            get { return _street; }
        }
        public string Phone
        {
            set { _phone = value; }
            get { return _phone; }
        }
        public string Mobile
        {
            set { _mobile = value; }
            get { return _mobile; }
        }
        public string Email
        {
            set { _email = value; }
            get { return _email; }
        }

        public Korea(int id, string name, string passportNumber, string nationality
            , string city, string state, string street, string phone, string mobile, string email) :
            base(id, name, passportNumber, nationality)
        {
            this._city = city;
            this._state = state;
            this._street = street;
            this._phone = phone;
            this._mobile = mobile;
            this._email = email;
        }

    }
}