async/awaitってこうじゃないの？

Program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
  class Program
  {
    static void Main(string[] args)
    {
      DoSomething();
    }

    private static async void DoSomething()
    {
      var s = await AsyncMethod("Sho");
      Console.WriteLine(s);
    }

    private static Task<string> AsyncMethod(string name)
    {
      return new Task<string>(() =>
        {
          Thread.Sleep(3000);
          return "Hello world, " + name;
        });

    }
  }
}