Some times the file not listing from frp server

Hi  Sorry for duplicate posting

When I use  the given command to list all the  CSV file from ftp server some times it would be getting slow and not listing the files . But some times the file would be listed. But at the same time I can access the file  through windows control panel without delay. I am using the following command

Function boolean FtpGetFile ( &

ulong hConnect, &

string lpszRemoteFile, string lpszNewFile, boolean fFailIfExists, ulong dwFlagsAndAttributes, &

ulong dwFlags, ulong dwContext ) ) Library "wininet.dll" Alias For "FtpGetFileA;Ansi"

Any help, it would be much appreciate