using System;

using System.Threading.Tasks;

public class Program

{

    public static void Main()

    {

        new Tests().Test();

    }

}

​

public class Tests

{

    public async void Test()

    {

        Console.WriteLine("SyncAsync start");

        var syncAsync = SyncAsync();        

        Console.WriteLine("SyncAsync awaiting");

        var syncAsyncResult = await syncAsync;

        Console.WriteLine("SyncAsync complete");

        Console.WriteLine("Sync start");

        var sync = Sync();      

        Console.WriteLine("Sync awaiting");

        var syncResult = await syncAsync;

        Console.WriteLine("Sync complete");

    }

    private async Task<object> SyncAsync()

    {

        Console.WriteLine("SyncAsync executing");

        return new object();

    }

    private Task<object> Sync()

    {

        Console.WriteLine("Sync executing");

        return Task.FromResult(new object());

    }

}