Get the number of elements actually contained in the ArrayList in C#

To get the number of elements actually contained in the ArrayList, the code is as follows −

Example

 Live Demo

using System;
using System.Collections;
public class Demo {
   public static void Main(String[] args){
      ArrayList list1 = new ArrayList();
      list1.Add("A");
      list1.Add("B");
      list1.Add("C");
      list1.Add("D");
      list1.Add("E");
      list1.Add("F");
      list1.Add("G");
      list1.Add("H");
      list1.Add("I");
      Console.WriteLine("Elements in ArrayList1...");
      foreach (string res in list1){
         Console.WriteLine(res);
      }
      ArrayList list2 = new ArrayList();
      list2.Add("A");
      list2.Add("B");
      list2.Add("C");
      list2.Add("D");
      list2.Add("E");
      list2.Add("F");
      list2.Add("G");
      list2.Add("H");
      list2.Add("I");
      Console.WriteLine("Elements in ArrayList2...");
      foreach (string res in list2){
         Console.WriteLine(res);
      }
      ArrayList list3 = new ArrayList();
      Console.WriteLine("Current capacity of ArrayList3: " + list3.Capacity);
      list3 = list2;
      Console.WriteLine("Current capacity of ArrayList3 (Updated) " + list3.Capacity);
      Console.WriteLine("Is ArrayList3 equal to ArrayList2? = "+list3.Equals(list2));
      Console.WriteLine("Count of elements in ArrayList2 = " + list2.Count);
      list2.Clear();
      Console.WriteLine("Count of elements in ArrayList2 (Updated) = " + list2.Count);
   }
}

Output

This will produce the following output −

Elements in ArrayList1...
A
B
C
D
E
F
G
H
I
Elements in ArrayList2...
A
B
C
D
E
F
G
H
I
Current capacity of ArrayList3: 0 
Current capacity of ArrayList3: 16
Is ArrayList3 equal to ArrayList2? = True
Count of elements in ArrayList2 = 9 
Count of elements in ArrayList2 (Updated) = 0

Example

Let us see another example −

 Live Demo

using System;
using System.Collections;
public class Demo {
   public static void Main(String[] args){
      ArrayList list1 = new ArrayList();
      list1.Add("A");
      list1.Add("B");
      list1.Add("C");
      list1.Add("D");
      list1.Add("E");
      list1.Add("F");
      list1.Add("G");
      list1.Add("H");
      list1.Add("I");
      Console.WriteLine("Current capacity of ArrayList1: " + list1.Capacity);
      Console.WriteLine("Elements in ArrayList1...");
      foreach (string res in list1){
         Console.WriteLine(res);
      }
      ArrayList list2 = new ArrayList();
      list2.Add("A");
      list2.Add("B");
      list2.Add("C");
      list2.Add("D");
      list2.Add("E");
      list2.Add("F");
      list2.Add("G");
      list2.Add("H");
      list2.Add("I");
      Console.WriteLine("Elements in ArrayList2...");
      foreach (string res in list2){
         Console.WriteLine(res);
      }
      ArrayList list3 = new ArrayList();
      list3 = list2;
      Console.WriteLine("Is ArrayList3 equal to ArrayList2? = "+list3.Equals(list2));
   }
}

Output

This will produce the following output −

Current capacity of ArrayList1: 16 Elements in ArrayList1...
A
B
C
D
E
F
G
H
I
Elements in ArrayList2...
A
B
C
D
E
F
G
H
I
Is ArrayList3 equal to ArrayList2? = True