ArrayList Concept in .Net

Provides a collection similar to an array, but that grows dynamically as
the number of elements change.

Example

static void Main()
{
    ArrayList list = new ArrayList();
    list.Add(11);
    list.Add(22);
    list.Add(33);
    foreach(int num in list)
    {
        Console.WriteLine(num);
    }
}

Output
11
22
33