Task.Factory.StartNew(async () => {
          System.Console.WriteLine("before: {0}", Thread.CurrentThread.ManagedThreadId);
          var x = await System.Net.Dns.GetHostAddressesAsync("google.com");
          // how to configure the managed thread id to be the same as the caller?
          System.Console.WriteLine("after: {0}", Thread.CurrentThread.ManagedThreadId);
        });