ASP.Net Core FTP server Error: 550 The process cannot access the file because it is being used by another process

hi

I am working on .Net Core 3.1, I published the api to host and when I tested everything looks good 

I added the some features and try to upload by ftp, it was return an error like below

550 The process cannot access the file because it is being used by another process.

Also can't delete the file, its return 550 Access is denied. 

Maybe it will fix by restarting to iis, but problem will continue

I think I missed the some features, maybe its dispose or else.