задача ооп

using System;
using System.Collections.Generic;
using System.Collections;

namespace ConsoleApp4
{
    internal class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("\n 1) Array: ");
            var FavoriteFood = new string[] { "Apple", "Cake", "Pizza", "Salad" };

            //поиск наиб числа среди целых чисел в arraylist

            Console.WriteLine("\n 2) ArrayList: ");
            ArrayList pos = new() { 1, 2, 3 };

            pos.AddRange(FavoriteFood);
            pos.Remove("Apple");
            pos.Remove("Salad");

            int[] ar = (int[])pos.ToArray(typeof(int));

            int max1 = ar.Max();

            Console.WriteLine(max1);

        }
    }
}