Clear a Hashtable in C#

Clear a Hashtable, using the Clear() method in C#.

The following is our Hashtable −

Hashtable h = new Hashtable();
h.Add(1, "Amit");
h.Add(2, "Sachin");
h.Add(3, "Rahul");

Use the clear method.

h.Clear();

If you will now try to display the Hashtable, nothing would get display since the Hashtable is empty.

Example

using System;
using System.Collections;
public class Demo {
   public static void Main() {
      Hashtable h = new Hashtable();
      h.Add(1, "Amit");
      h.Add(2, "Sachin");
      h.Add(3, "Rahul");
      Console.WriteLine("Keys and Values list:");
      foreach (var key in h.Keys ) {
         Console.WriteLine("Key = {0}, Value = {1}",key , h[key]);
      }
      // clear all key value pairs
      Console.WriteLine("The Hashtable key and Value Pairs are empty now...");
      h.Clear();
      foreach (var key in h.Keys ) {
         Console.WriteLine("Key = {0}, Value = {1}",key , h[key]);
      }
   }
}

Output

Keys and Values list:
Key = 3, Value = Rahul
Key = 2, Value = Sachin
Key = 1, Value = Amit
The Hashtable key and Value Pairs are empty now...