using System;

using System.Collections;

public class Program

{

    public static void Main()

    {

        Hashtable ht = new Hashtable();

        ht.Add("a","apple");

        ht.Add("b","ball");

        ht.Add("c","cat");

        ht.Add(1,"one");

        foreach (DictionaryEntry ob in ht)

        {

            Console.WriteLine(ob.Key + " " + ob.Value);

        }

        Console.WriteLine();

        ht.Remove("c");

        foreach (DictionaryEntry ob in ht)

        {

            Console.WriteLine(ob.Key + " " + ob.Value);

        }

        Console.WriteLine();

        IDictionaryEnumerator e = ht.GetEnumerator();

        while(e.MoveNext())

        {

            string str = e.Key.ToString() + " " + e.Value.ToString();

            Console.WriteLine(str);

        }

    }

}