How to add items to ArrayList in C#?

ArrayList is a non-generic collection in C# that can be dynamically resized.

Let us see how to initialize ArrayList in C# -

ArrayList arr= new ArrayList();

Add items to array list -

ArrayList arr1 = new ArrayList();
arr1.Add(30);
arr1.Add(70);

Let us see the complete example of implementing ArrayList in C#. Here we have two array lists. The second array list is appended to the first list.

Example

using System;
using System.Collections;

public class MyClass {
   public static void Main() {
      ArrayList arr1 = new ArrayList();
      arr1.Add(30);
      arr1.Add(70);

      ArrayList arr2 = new ArrayList();
      arr2.Add(200);
      arr2.Add(240);

      arr1.AddRange(arr2);
      for (int i = 0; i < arr1.Count; i++)
      Console.WriteLine(arr1[i]);
   }
}

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