using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var myList = new List<MyClass>();

        var myElement = myList.SingleOrDefault(e => e.Id == 1);

        if (myElement == null)

        {

            Console.WriteLine("null");

        }

        else

        {

            Console.WriteLine("NOT null");

        }

        Console.WriteLine("The End");

    }

}

​

public class MyClass

{

    public int Id { get; set; }

    public string Name { get; set; }

}