SignalR

https://mva.microsoft.com/zh-tw/training-courses/-real-time-web-asp-net-signalr--11197?l=LKjML5GBB_804984382

https://www.youtube.com/watch?v=bL39JH11S4o&index=2&list=PL_c9BZzLwBRKJugyyAdhBoAPRs1DdaS7n

http://www.bamn.cn/course/lesson/136?p=1