using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var filterBy = new Item[] { new Item { Id = 2, Name = "Second" } };

        var filtered = new Item[] {

            new Item { Id = 1, Name = "First"},

            new Item { Id = 2, Name = "Second" }

        };

        var itemValue = filtered.Where(item => item.Id == 4).DefaultIfEmpty(new Item { Name = "Default Value" }).First().Name;

        Console.WriteLine(itemValue);

        //filtered.ToList().ForEach(item => Console.WriteLine(item.Name));

    }

    public class Item {

        public int Id { get; set; }

        public string Name { get; set; }

    }

}

​

​