static void Main(string[] args)
        {
            Test();
            Console.ReadKey();
        }
    
        static async void Test()
        {
            Task<int> returnedTaskTResult = GetTaskOfTResultAsync();
            SynchronousTask();
            int intResult = await returnedTaskTResult;
            //int intResult = await GetTaskOfTResultAsync();
            Console.WriteLine("GetTaskOfTResultAsync result " + intResult);
        }
    
        static async Task<int> GetTaskOfTResultAsync()
        {
            int hours = 0;
            Console.WriteLine("GetTaskOfTResultAsync start thread id "+Thread.CurrentThread.ManagedThreadId);
            await Task.Delay(10000);
            Console.WriteLine("GetTaskOfTResultAsync end thread id " + Thread.CurrentThread.ManagedThreadId);
    
            return hours;
        }
    
        static void SynchronousTask()
        {
            Console.WriteLine("SynchronousTask start thread id " + Thread.CurrentThread.ManagedThreadId);
            Thread.Sleep(2000);
            Console.WriteLine("SynchronousTask end thread id " + Thread.CurrentThread.ManagedThreadId);
        }