1         static void Main(string[] args)
 2         {
 3             var task = new Task(() =>
 4             {
 5                 Console.WriteLine("task start....");
 6                 Thread.Sleep(2000);
 7                 Console.WriteLine("task end....");
 8             });
 9             task.Start();
10             Console.WriteLine("main start....");
11             Thread.Sleep(1000);
12             Console.WriteLine("main end....");
13             Console.ReadLine();
14         }

        public async void Async()
        {
            await Task.Run(() => {
                Console.WriteLine("task start..");
                /****/
                Console.WriteLine("task end..");
            });
        }