using System;

using System.Threading;

using System.Threading.Tasks;

public class Program

{

    public static void Main()

    {

        Test t = new Test();

        Console.WriteLine(DateTime.Now.ToString("HH:mm:ss.fff") + " test created");

        Thread.Sleep(100);

        t.OnReadyToGeneratePolarImages();

        Console.WriteLine(DateTime.Now.ToString("HH:mm:ss.fff") + " Image ready");

        Thread.Sleep(100);

        t.GenerateCsvFiles();

        Console.WriteLine(DateTime.Now.ToString("HH:mm:ss.fff") + " csv ready");

    }

}

​

class Test

{

    TaskCompletionSource<bool> imageSavedTcs = new TaskCompletionSource<bool>(TaskCreationOptions.RunContinuationsAsynchronously);

    TaskCompletionSource<bool> _csvFileGeneratedTcs = new TaskCompletionSource<bool>(TaskCreationOptions.RunContinuationsAsynchronously);

​

    public void OnReadyToGeneratePolarImages()

    { 

        imageSavedTcs?.TrySetResult(true);

    }

​

    public void GenerateCsvFiles()

    {

        _csvFileGeneratedTcs.SetResult(true);

    }

    public Test()

    {

        Task.Run(async () =>

                {

                    var tasksToComplete = new [] { imageSavedTcs.Task, _csvFileGeneratedTcs.Task };

                    await Task.WhenAll(tasksToComplete);

                    SaveResults();

                });

    }

    private void SaveResults()

    {

        Console.WriteLine(DateTime.Now.ToString("HH:mm:ss.fff") + " save results");

    }

}