Remove an item from a Hashtable in C#

Ankith Reddy

Answered on 12th Sep, 2018

The following is our Hashtable −

Hashtable h = new Hashtable();
h.Add(1, "Jack");
h.Add(2, "Henry");
h.Add(3, "Ben");
h.Add(4, "Chris");

To remove an item, use the Remove() method. Here, we are removing the 3rd element.

h.Remove(3);

Let us see the complete example.

Example

Live Demo

using System;
using System.Collections;
public class Demo {
   public static void Main() {
      Hashtable h = new Hashtable();
      h.Add(1, "Jack");
      h.Add(2, "Henry");
      h.Add(3, "Ben");
      h.Add(4, "Chris");
      Console.WriteLine("Initial list:");
      foreach (var key in h.Keys ) {
         Console.WriteLine("Key = {0}, Value = {1}",key , h[key]);
      }
      // removing an item
      h.Remove(3);
      Console.WriteLine("New list after removing an item: ");
      foreach (var key in h.Keys ) {
         Console.WriteLine("Key = {0}, Value = {1}",key , h[key]);
      }
   }
}

Output

Initial list:
Key = 4, Value = Chris
Key = 3, Value = Ben
Key = 2, Value = Henry
Key = 1, Value = Jack
New list after removing an item: 
Key = 4, Value = Chris
Key = 2, Value = Henry
Key = 1, Value = Jack