Using PLINQ: AsOrdered

Program.cs

namespace MultiThreadingExamples
{
    class Program
    {
        static void Main(string[] args)
        {
            var aLotOfNumbers = Enumerable.Range(0, 100);

            var parallelEvenNumbers = aLotOfNumbers
                .AsParallel()
                .AsOrdered()
                .Where(number => number % 2 == 0)
                .ToArray();

            foreach(var evenNumber in parallelEvenNumbers)
                Console.WriteLine(evenNumber);

            Console.ReadLine();
        }
    }
}