using System;

using System.Linq;

namespace ConsoleApplication

{

    public static class Program

    {

        public static void Main ()

        {

            var numbers = Enumerable.Range(0, 20);

            try

            {

                var parallelResult = numbers.AsParallel()

                .Where(i => IsEven(i));

                parallelResult.ForAll(e => Console.WriteLine(e));

            }

            catch (AggregateException e)

            {

                Console.WriteLine("Therewhere {0} exceptions", e.InnerExceptions.Count);

            }

        }

        public static bool IsEven (int i)

        {

            if (i % 10 == 0) throw new ArgumentException("i");

            return i % 2 == 0;

        }

    }

}

​