C# find a value in a Hashtable

using System;
using System.Collections;

public class Demo {
   public static void Main() {
      Hashtable h = new Hashtable();
      h.Add(1, "Jack");
      h.Add(2, "Henry");
      h.Add(3, "Ben");
      h.Add(4, "Chris");
      Console.WriteLine("Keys and Values list:");
      foreach (var key in h.Keys ) {
         Console.WriteLine("Key = {0}, Value = {1}",key , h[key]);
      Console.WriteLine("Value Chris exists? "+h.ContainsValue("Chris"));
      Console.WriteLine("Value Tom exists? "+h.ContainsValue("Tom"));


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