using System;

using System.Threading;

using System.Threading.Tasks;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello from main thread {0}", Thread.CurrentThread.ManagedThreadId);

        //Implicitly

        UsingParallelInvoke();  

        //Explicitly

        UsingTaskRun();

        UsingTaskNew();

        UsingTaskFactory();

    }

    protected static void UsingParallelInvoke() {

        Console.WriteLine("Using parallel invoke");

        Parallel.Invoke(() => Console.WriteLine("Hello from Task {0}", Thread.CurrentThread.ManagedThreadId));

    }

    protected static void UsingTaskRun() {

        Console.WriteLine("Using task run static method");

        Task taskA = Task.Run(() => Console.WriteLine("Hello from Task {0}", Thread.CurrentThread.ManagedThreadId));

        taskA.Wait();

    }

    protected static void UsingTaskNew() {

        Console.WriteLine("Using new to create task");

        Task taskA = new Task(() => Console.WriteLine("Hello from Task {0}", Thread.CurrentThread.ManagedThreadId));

        taskA.Start();

        taskA.Wait();

    }

    protected static void UsingTaskFactory() {

        Console.WriteLine("Using task factory");

        Task taskA = Task.Factory.StartNew(() => Console.WriteLine("Hello from Task {0}", Thread.CurrentThread.ManagedThreadId));

        taskA.Wait();

    }

}