说明：  c#高级编程（中文版），非常经典的教程，数据库，基础语言，网络通信，网络编程，窗体应用等均有很深入的讲解，很值得研究
(C # advanced programming (Chinese version), a very classic course, database, basic language, network communication, network programming, window application, etc. all have a very in-depth explanation, which is worth studying)