using System;

using System.Threading;

using System.Threading.Tasks;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        var task = MyTask();

        Receiver1Async(task).Wait();

        Receiver2Async(task).Wait();

    }

    private static async Task Receiver1Async(Task task)

    {

        try

        {

            await task;

        }

        catch (Exception e)

        {

            var exp = e.ToString();

            Console.WriteLine("reviever 1 recieves " + exp);

        }

    }

    private static async Task Receiver2Async(Task task)

    {

        try

        {

            await task;

        }

        catch (Exception e)

        {

            var exp = e.ToString();

            Console.WriteLine("reviever 2 recieves " + exp);        }   

    }

    private static Task MyTask()

    {

        var taskSource = new TaskCompletionSource<bool>();

        taskSource.SetException(new InvalidOperationException());

        return taskSource.Task;

    }

}