using System;

using System.Collections;

public class Program

{

    public static void Main()

    {

        Hashtable ht = new Hashtable();

        ht.Add(1, "One");

        ht.Add(2, "Two");

        ht.Add(3, "Three");

        ht.Add(4, "Four");

        ht.Add(5, null);

        ht.Add("Fv", "Five");

        ht.Add(8.5F, 8.5F);

        Console.WriteLine("Number of elements: {0}", ht.Count);

        string strValue1 = (string)ht[2];

        string strValue2 = (string)ht["Fv"];

        float fValue = (float) ht[8.5F];

        Console.WriteLine(strValue1);

        Console.WriteLine(strValue2);

        Console.WriteLine(fValue);

​

    }

}