Add an element with the specified key and value into the Hashtable in CSharp

using System; /*from w  ww.  j  a  va  2 s .c  o m*/
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]); 
  } 
}