using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var list  = new List<Element>();

        var element = new Element();

        for(int i = 0; i<10; i++){

            element.Id = i;

            element.Description = $"Element {i+1}";

            list.Add(element);

        }

        foreach(var el in list)

            Console.WriteLine(el);  

    }

}

​

public sealed class Element

{

    public int? Id {get; set;}  

    public string Description  {get; set;}

    public override string ToString()

    {

        return $"{Id} - {Description}";

    }

}