C# 5.0 async void vs async Task

 private void button1_Click(object sender, EventArgs e)
        {
            TestReturnsVoid();//會在UI Thread拋出異常，導致程序崩潰
        }

        private void button2_Click(object sender, EventArgs e)
        {
            TestReturnsTask();//會在另外一個線程拋出異常，類似TheadPool的效果
        }

        private async void TestReturnsVoid()
        {
            await Test();
        }

        private async Task TestReturnsTask()
        {
            await Test();
        }

        private async Task Test()
        {
            throw new NotImplementedException();
        }

結論
1. async void 僅僅推薦用在UI event handler
2.總是處理事件 ： TaskScheduler.UnobservedTaskException