async/awaitの使い方

gistfile1.txt

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            asyncMethod();
        }

        private async void asyncMethod()
        {
            for(int i=0; i<5; i++)
            {
                Debug.WriteLine("asyncMethod - start" + i);
                await Task.Run(() =>
                {
                    Debug.WriteLine("task - start" + i);
                    Thread.Sleep(2000);  // 重たい処理のつもり
                    Debug.WriteLine("task - end" + i);
                });
                Debug.WriteLine("asyncMethod - end" + i);
            }
        }
    }
}