using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        List<Item> items = new List<Item>()

            .AddAlso(new Item{ Id=1, Name="Ball", Description="Hello" })

            .AddAlso(new Item{ Id=2, Name="Hat", Description="Test" });

        foreach(var item in items)

            Console.WriteLine("Id {0} Name {1}, Description {2}",item.Id,item.Name,item.Description);

    }

}

public static class Extensions

{

    public static List<T> AddAlso<T>(this List<T> list,T item)

    {

        list.Add(item);

        return list;

    }

}

public class Item

{

    public int Id{get;set;}

    public string Name{get;set;}

    public string Description{get;set;}

}