Store Multiple object in Hash Table and access using Key

Sometime it’s common requirement to store a collection of object in daily project development.We can use various technique to do that. Here I want to show how to use Hash Table to achieve this.And the most advantage of hashtable is you can access any object using it’s key. As in save time I have used PersonId as key of 
Hash Table.  

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;
using System.Data.SqlClient;
using System.Data;
using System.Diagnostics;
 namespace BlogProject
{    class Person    {        public Int32 PersonID { get; set; }        public string Name { get; set; }         Hashtable Hs = new Hashtable();        public void SetData(Person p)        {            Hs.Add(p.PersonID, p);        }        public void ShowData(int Key)        {            Person objP =(Person) Hs[Key];            Console.WriteLine("Name:-"+ objP.Name);            Console.WriteLine("Person ID:-" + objP.PersonID);        }    }       class Program    {        static void Main(string[] args)        {            Person p = new Person();            p.PersonID = 100;            p.Name = "Sourav";             p.SetData(p);             p = new Person();            p.PersonID = 101;            p.Name = "Bapi";             p.SetData(p);            p.ShowData(101);              Console.ReadLine();        }    } }