using System;

using System.Collections.Generic;

using System.Linq;

using System.Threading;

using System.Threading.Tasks;

using System.Windows.Forms;

public class Program

{

        protected static Form frm = null;

​

        [STAThread]

        static void Main(string[] args)

        {

            frm = new Form();

            int tasksCount = 10;

            var cts = new CancellationTokenSource();

​

            Enumerable.Range(0, tasksCount).ToList()

                      .ForEach(x => frm.Controls.Add(new Label() { Left = 10, Top = 22 * x, }));

​

            Task.Run(() => CreateJobs(tasksCount, cts.Token));

            Application.Run(frm);

            cts.Cancel();

            cts.Dispose();

            Console.ReadKey();

            // etc

            Console.ReadLine();

        }

​

        static async Task CreateJobs(int numberOfTasks, CancellationToken token)

        {

            List<Task> tasks = new List<Task>();

            for (int i = 0; i < numberOfTasks; i++) {

                tasks.Add(PayLoad(i, token));

            }

            await Task.WhenAll(tasks);

        }   

​

        static async Task PayLoad(int taskNumber, CancellationToken token)

        {

            Console.WriteLine($"Task {taskNumber} is starting...");

            for (int i = 1; i < 10; i++) {

                if (token.IsCancellationRequested) return;

                Console.WriteLine($"Task {taskNumber} - iteration {i}    ");

                frm.BeginInvoke(new MethodInvoker(() => frm.Controls[taskNumber].Text = i.ToString()));

                await Task.Delay(1000);

            }

        }

}