using System;

using System.Threading.Tasks;

using System.Linq;

​

public class Program

{

    public static async Task Main()

    {

        try

        {

            await Task.WhenAll(Enumerable.Range(0, 5).Select(async i =>

            {

                await Task.Delay((i + 1) * 1000);

                if (i == 1 || i == 3)

                {

                    Console.WriteLine($"Throwing {i}");

                    throw new Exception($"Error {i}");

                }

                Console.WriteLine($"Completing {i}");

​

                return i;

            }));

​

        }

        catch (Exception e)

        {

            Console.WriteLine($"Final Catching {e.GetType().FullName} {e is AggregateException}");

        }

    }

}