LINQ

static void Main(string[] args)
        {
            int[] numbers = { 5, 4, 1, 3, 9, 8, 6, 7, 2, 0 };

            var lowNums =
                from num in numbers
                where num < 5
                select num;

            Console.WriteLine("Numbers < 5:");
            foreach (var x in lowNums)
            {
                Console.WriteLine(x);
            }
            Console.ReadLine();
        }