using System;

using System.Collections;

public class Program

{

    public static void Main()

    {

        var arr = new int[] { 1, 2, 3 };

        var ilist = (IList)arr;

        try

        {

            ilist.Insert(0, 0);

            Console.WriteLine("No Exception");

        }

        catch (Exception ex)

        {

            Console.WriteLine("[Error]: " + ex.Message);

        }

    }

}