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How to insert an item in ArrayList in C#?
To insert an item in an already created ArrayList, use the Insert() method.
Firstly, set elements −
ArrayList arr = new ArrayList(); arr.Add(45); arr.Add(78); arr.Add(33);
Now, let’s say you need to insert an item at 2nd position. For that, use the Insert() method −
// inserting element at 2nd position arr.Insert(1, 90);
Let us see the complete example −
Example
using System;
using System.Collections;
namespace Demo {
public class Program {
public static void Main(string[] args) {
ArrayList arr = new ArrayList();
arr.Add(45);
arr.Add(78);
arr.Add(33);
Console.WriteLine("Count: {0}", arr.Count);
Console.Write("ArrayList: ");
foreach(int i in arr) {
Console.Write(i + " ");
}
// inserting element at 2nd position
arr.Insert(1, 90);
Console.Write("
ArrayList after inserting a new element: ");
foreach(int i in arr) {
Console.Write(i + " ");
}
Console.WriteLine("
Count: {0}", arr.Count);
}
}
}Output
Count: 3 ArrayList: 45 78 33 ArrayList after inserting a new element: 45 90 78 33 Count: 4
Updated on: 22-Jun-2020
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