using System;

using Microsoft.Net.Http.Headers;

using System.Diagnostics;

using System.Threading.Tasks;

using System.Threading;

​

public class Program

{

    static async Task Main()

    {

        var tokenSource2 = new CancellationTokenSource();

        tokenSource2.Cancel();

        CancellationToken ct = tokenSource2.Token;

​

        var task = Task.Run(() =>

        {

            // Were we already canceled?

            ct.ThrowIfCancellationRequested();

​

            bool moreToDo = true;

            while (moreToDo)

            {

                // Poll on this property if you have to do

                // other cleanup before throwing.

                if (ct.IsCancellationRequested)

                {

                    // Clean up here, then...

                    ct.ThrowIfCancellationRequested();

                }

            }

        }, tokenSource2.Token); // Pass same token to Task.Run.

​

        //tokenSource2.Cancel();

​

        // Just continue on this thread, or await with try-catch:

        try

        {

            await task;

        }

        catch (OperationCanceledException e)

        {

            Console.WriteLine($"{nameof(OperationCanceledException)} thrown with message: {e.Message}");

        }

        finally

        {

            tokenSource2.Dispose();

        }

​

        Console.ReadKey();

    }

​

}