Complete the development of my first Windows Service

Happy, it can be said that it is a summary of my recent work. Five threads are started in the service to update the database data, generate various EXCEL reports through Web requests, and FTP the reports to the server through winsocket protocol, send the work status to the email address through the winsocket protocol.
Haha, these are all very good attempts. I have a very real impression on some underlying FTP and SMTP protocols. I can do some complicated applications next time, maybe you can make a dedicated tool similar to pubdl, haha.
There is also the joy of building a service ~~~