amazon ec2 - Cannot make new directories in FTP (C#) -

i trying upload file ftp server (ec2) via simple c# windows application made.

problem i'm having : if directory exists, can make file inside it. however, if directory doesn't exist, cannot make directory.

what checked : double checked write permissions. logged in via winscp , can make new directories in there without problems. i've given user privileges.

my code :

private async void fileftpupload(string sourcefilepath, string folderpath) {  string ftpurl = @"ftp://xx.xxx.xxx.xxx/" + "trial/12/1.txt";  console.writeline("ftp url : " + ftpurl);  string ftpusername = "myusername";  string ftppassword = "mypassword";   try {   string filename = path.getfilename(sourcefilepath);   string ftpfullpath = ftpurl;   webrequest ftp = webrequest.create(ftpurl);   ftp.method = webrequestmethods.ftp.makedirectory;   ftp.credentials = new networkcredential(ftpusername, ftppassword);    ftp.method = webrequestmethods.ftp.uploadfile;    filestream fs = file.openread(sourcefilepath);   byte[] buffer = new byte[fs.length];   fs.read(buffer, 0, buffer.length);   fs.close();    stream ftpstream = ftp.getrequeststream();   ftpstream.write(buffer, 0, buffer.length);   ftpstream.close();  } catch (exception ex) {   console.writeline("exception occurred : " + ex);   //throw ex;  } } 

now, if "trial/12/" exists, 1.txt made. otherwise, error :

system.net.webexception: remote server returned error: (553) file name not allowed.

i'm not sure what's happening , what's not. use assistance.

thank you.

edit : when : string ftpurl = @"ftp://xx.xxx.xxx.xxx/" + "trial";

it doesn't make directory. makes file named "trial".

doing :

string ftpurl = @"ftp://xx.xxx.xxx.xxx/" + "trial/"; 

gives same error 553

you have seperate code 2 requests. first should create directory , second upload file.

var filepath = @"ftp://xx.xxx.xxx.xxx/trial/12/1.txt"; var credentials = new networkcredential(ftpusername, ftppassword);  {     // create directory     var directorypath = path.getdirectoryname(filepath);     var request = webrequest.create(directorypath);     request.method = webrequestmethods.ftp.makedirectory;     request.credentials = credentials;     using(var response = (ftpwebresponse)requestdir.getresponse())      {         // todo: handle errors     } }  {     // upload file     using (webclient client = new webclient())     {         client.credentials = credentials;         client.uploadfile(filepath, "stor", sourcefilepath);     } }