using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var numbers = new List<int> { 1, 2, 3};

        var query = from n in numbers

            where n != 3

            select n;

        int queryCount = query.Count();

        numbers.Add(5);

        Console.WriteLine("query.Count(): " + query.Count());

        numbers.Add(3);

        Console.WriteLine("query.Count(): " + query.Count());

        Console.WriteLine("numberOfItems: " + queryCount);

    }

}