Hi DanielFran,

Refer below code and implement in windows form application.

Check Internet Connection (Download) Speed using C# and VB.Net in ASP.Net

Let me know if any issue with the code.

Hello

Thanks. However, I want to test the speed of the connected FTP server, not the current internet speed.

Refer below link.

https://stackoverflow.com/questions/27359700/im-trying-to-get-ftp-download-file-speed-but-sometimes-im-getting-infinity-why