please help me with the output as instructed within the C# code

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            ObservableCollection<MyItems> _list1 = new ObservableCollection<MyItems>();
            _list1.Add(new MyItems("A001", "Deodorant", 10));
            _list1.Add(new MyItems("A0ZZ", "Hairspray", 20));
            _list1.Add(new MyItems("A002", "Toothpaste", 30));
            _list1.Add(new MyItems("0001", "Advacado", 0));

            ObservableCollection<MyItems> _list2 = new ObservableCollection<MyItems>();

            _list2.Add(new MyItems("A001", "Deodorant", 10));
            _list2.Add(new MyItems("A002", "Toothpaste", 30));

            /* TODO: Develop logic that will add all items from _list1 that are not already present into _list2.  Items should be added into specific 
          * index positions according to the following rule: if DisplaySequence is not equal to zero, insert into the correct position according 
          * to that value; if DisplaySequence is equal to zero insert alphabetically according to the ItemName. The below foreach statement should
          * output in the following order:
          * 
          * 0001 - Advacado
          * A001 - Deodorant
          * A0ZZ - Hairspray
          * A002 - Toothpaste
          */

            foreach (var i in _list2)
            {
                Console.WriteLine(i.ItemName + " - " + i.ItemDescription);
            }

            Console.WriteLine("Press any key to exit.");
            Console.ReadKey();
        }
    }

    class MyItems
    {
        public MyItems(string _itemName, string _itemDescription, int _displaySequence)
        {
            ItemName = _itemName;
            ItemDescription = _itemDescription;
            DisplaySequence = _displaySequence;
        }

        public string ItemName { get; set; }
        public string ItemDescription { get; set; }
        public int DisplaySequence { get; set; }
    }
}