using System;
using System.Threading;
using System.Threading.Tasks;

namespace test1
{
  public class Program
  {
    private static async void SampleAsync()
    {
      Console.WriteLine("SampleAsync start\n");

      await Task.Run((Action) LongProccess);

      Console.WriteLine("SampleAsync end\n");
    }

    private static void LongProccess()
    {
      Console.WriteLine("LongProc start\n");

      Thread.Sleep(TimeSpan.FromSeconds(10));

      Console.WriteLine("LongProc end\n");
    }

    private static void Main()
    {
      Console.WriteLine("Main start\n");

      SampleAsync();

      Console.WriteLine("Main end\n");
      Console.ReadLine();
    }
  }
}