using System;

​

class Item 

{

    private string property;

    public Item (string property)

    {

        this.property = property;

    }

    public string someMethod () 

    {

        return property;

    }

}

​

public class Program

{

    public static void Main()

    {

        object[] objArray = {new Item("01"), new Item("02")};

        Item[] items = Array.ConvertAll(objArray, x => (Item)x);

        foreach(Item item in items)

        {

            Console.WriteLine(item.someMethod());

        }

    }

}