using System;

using System.Linq;

using System.Threading.Tasks;

public class Program

{

    public static async Task Main()

    {

        await Example();

    }

    private static async Task Example()

    {

        var tasks = new [] { DoLongThingAsyncEx1(), DoLongThingAsyncEx2() };

​

        try 

        {

            await Task.WhenAll(tasks);

        }

        catch (Exception) 

        {

            var exceptions = tasks.Where(t => t.Exception != null)

                                  .Select(t => t.Exception);

            foreach (var exception in exceptions)

            {

                Console.WriteLine(exception.ToString());

            }

        }

    }

​

    private static Task DoLongThingAsyncEx1()

    {

        return Task.Run(() => { throw new InvalidTimeZoneException(); });

    }

​

    private static Task DoLongThingAsyncEx2()

    {

        return Task.Run(() => { throw new InvalidOperationException(); });

    }

}