using System; using System.Collections; class HashtableDemo { public static void Main() { Hashtable ht = new Hashtable(); ht.Add("a", "A"); ht.Add("b", "B"); ht.Add("c", "C"); ht.Add("e", "E"); // Get a collection of the keys. ICollection c = ht.Keys; foreach(string str in c) Console.WriteLine(str + ": " + ht[str]); } }