using System;

using System.Threading.Tasks;

public class Program

{

    public static async Task Main()

    {

        Task t = null;

        try

        {

            t = Task.WhenAll(Task.FromException(new System.TimeoutException("Timeout")), Task.FromException(new System.InvalidOperationException("invalid")));

            await t;

        }

        catch (Exception e)

        {

            Console.WriteLine(e);

            Console.WriteLine(t.Exception);

        }       

    }

}