using System;

using System.Linq;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        var a = new List<int>() { 1,2,3,4 };

        var b = new List<int>() { 1,2 };

        var c = a.Where(x=> !b.Contains(x));

        var d = a.Where(!b.Contains);

        foreach(int l in d){

            Console.WriteLine(l);

        }

    }

}