copying files from one folder to another on FTP server

Question

Hi, I have a C# code that impletments a FTP client library. I can achieve basic directory manipulation operations by sending commands like CWD, MKD etc. to the Socket object. However, I am unable to copy a file in one folder to another folder on FTP server. Any ideas ? All I can do is to move the file from one folder to another by using renaming commands. Your help is much appreciated. Thanks Arpit.