public SiteCommand(FtpServer ftp)
 {
     ftp.AddCustomCommand("SITE", new OnCommandHandler(Cmd_SITE));
     AddCustomCommand("ADDUSER", new OnCommandHandler(Cmd_Site_AddUser));
     AddCustomCommand("CHANGE", new OnCommandHandler(Cmd_Site_Change));
     AddCustomCommand("DELUSER", new OnCommandHandler(Cmd_Site_DelUser));
     AddCustomCommand("PASSWD", new OnCommandHandler(Cmd_Site_Passwd));
     AddCustomCommand("HELP", new OnCommandHandler(Cmd_Site_Help));
 }