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 firstItemA = filtered.FirstOrDefault(item => item.Id == 4);

        //var firstItemB = filtered.First(item => item.Id == 4);

        var firstItemC = filtered.Where(item => item.Id == 2).First<Item>();

        Console.WriteLine(firstItemC.Name);

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

    }

    public class Item {

        public int Id { get; set; }

        public string Name { get; set; }

    }

}

​

​