Is it possible to remove from the FTP folder is not empty.
or in the first need to delete all the files in the folder?
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it really depends on which library are you using, each 3rd party library supports a different functionally.
For instance; if you are using builtin .Net Framework WebRequest class, then the answer is simply "NO"
The builtin
WebRequestdoesn’t support deleting non-empty directories from FTP.
But as you might already know (in case you are using the builtin WebRequest class) then you can actually remove a folder like this:
FtpWebRequest ftp_request = (FtpWebRequest)WebRequest.Create(your_directory_goes_here);
ftp_request.Method = WebRequestMethods.Ftp.RemoveDirectory;
/* And then simply make a call to the web request. */
But this as said previously Will Not delete NON-EMPTY directories.
So the solution would be either to use a 3rd party .Net library that supports deleting directories and contained files in a single call, or otherwise make a recursive call yourself, something like this:
private void delete_ftp_directory(string parent, string path)
{
string path_segment = get_next_path_segment(path); /* first valid segment before a separator / or \ */
string path = advance_path_segment(path); /* update path variable to point to the next segment if any */
if (ftp_directory_has_files(Path.Combine(parent, path_segment)))
{
/* has files delete them all. */
delete_ftp_directory(parent, path);
}
/* Now delete the directory itself */
ftp_delete_empty_directory(Path.Combine(parent, path_segment));
}
Hope that gives you an idea of what should be done 
Thanks a lot to your answer,
i really used, .Net Framework WebRequest class.
I solved the problem,
in first requested for FTP file names,
and then delete them and then delete the folder
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