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FTP component written with fully managed code

, 7 May 2002
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A .NET FTP component

Recently, I needed to write a program which could automatically download files from an FTP server. Unfortunately the .NET Framework lacks good support for FTP services. Although a few companies have already written libraries which can be used directly, the price is really too high for poor men like me. As a result, I decided to write my own FTP library and here it is.


This FTP component is an incomplete implementation of my design nor has it been fully tested. Please keep in mind it may contain bugs or even design flaws.

Connect to FTP server

FtpSession session = new FtpSession();
session.Server = "localhost";
session.Port   = 21; //not required if using the default ftp port 21
session.Connect("anonymous", "");

Enum subdirectories and files

* It is possible an incorrect list will be returned.
* In this case, you need to add your own regular expression to 
* interpret the list result (try to find it within ftpdirectory.cs)
FtpDirectory root = session.RootDirectory;
foreach(FtpDirectory d in root.SubDirectories)
    //do something

    foreach(FtpFile f in root.Files)
        //do something

         * Only CurrentDirectory's item can be legally used.
         * Do not save down FtpDirectory and FtpFile for later use
         * unless you are sure they belongs to CurrentDirectory.
         * Here is some sample may cause problems
        FtpDirectory d1 = session.CurrentDirectory.FindSubdirectory("somesubdir");
        FtpDirectory d2 = session.CurrentDirectory.FindSubdirectory("othersubdir");
        session.CurrentDirectory = d2;
         * Following 2 line will cause problem since CurrentDirectory 
         * is not d1's parent anymore
        foreach(FtpDirectory d in d1) 

Change current directory

session.CurrentDirectory = somesubdirectory

Upload file

//Blocking call
//Async call using callback
session.CurrentDirectory.BeginPutFile("somelocalfile", +
    new FtpAsyncDelegate(yourcallback);
//Async call using event
session.EndPutFile += new FtpFileEventHandler(yourhandler);
    //Manually upload the file
    FileInfo fi = new FileInfo(localfilefullpath);
    Stream r = File.OpenRead(fi.FullName);

    // actually will return a FtpOutputDataStream object
    Stream w = session.CurrentDirectory.CreateDataStream(fi.Name); 
    int readed;
    byte[] buff = new byte[4096];
    while((readed=r.Read(buff, 0, 4096) != 0)
	    w.Write(buff, 0, readed);
    * Must call FtpDataStream.Close().
    * This is because it will try to read the file transfer 
    * result from FTP server.

Download file

//Blocking call
//Async call using callback
session.CurrentDirectory.BeginGetFile("someremotefile", + 
    new FtpAsyncDelegate(yourcallback);
//Async call using event
session.EngGetFile += new FtpFileEventHandler(yourhandler);

//Manually download a file
Stream r = File.OpenWrite(localfilepath);

    FtpFile remoteFile = session.CurrentDirectory.FindFile(remotefilename);
    Stream w = remoteFile.GetOutputDataStream();
    int readed;
    byte[] buff = new byte[4096];
    while((readed=r.Read(buff, 0, 4096) != 0)
        w.Write(buff, 0, readed);
    * Must call FtpDataStream.Close().
    * This is because it will try to read the file transfer 
    * result from FTP server.

Create a new file in ftp server

//method 1
//method 2
Stream s = session.CurrentDirectory.CreateFileStream(newfilename);
// do something with s

Delete a file from ftp server

//method 1
//method 2
IFtpItem item = session.CurrentDirectory.FindItem(remotefilename)
if(item != null)

Delete a subdirectory

//method 1

//method 2
IFtpItem item = session.CurrentDirectory.FindItem(sub directoryname)
if(item != null)

Refresh the content of ftp directory

* If you have saved down some some directory item(subdir or ftpfile).
* They will become invalid after you refresh the directory
FtpFile f = session.CurrentDirectory.FindFile(somefile);
// you can not leagally use f anymore after the following line

Rename a file or directory

IFtpItem item = session.FindItem(directoryorfile);
if(item != null)
    session.RenameSubitem(item, newname);

Known Limitations

  • No support for active mode
  • No support for proxy server


  • Removed FileCollection and DirectoryCollection
  • Added support for VB's for each statement
  • VB client can directly access FtpDirectory.Files and FtpDirectory.SubDirectories with for each statement now.

Please send me a email if you find any bugs. Please include at least a description of the bug you have found. It will be nice if a testing program or even a solution is included.

Have fun.


This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here


About the Author

Alex Kwok
Web Developer
Hong Kong Hong Kong
No Biography provided

Comments and Discussions

QuestionBug Report: the method FtpDirectory.FindFile is always case-sensitive! PinmemberDr.Benj8-Apr-12 21:11 
QuestionBug Report: the FtpFile.Rename method is empty PinmemberDr.Benj8-Apr-12 21:08 
BugI had Fixed Some Bug of this Ftp Lib Pinmemberwilliechen16-Dec-11 0:59 
QuestionNot all directories are listet - UnixListLineExpression needs any change PinmemberNasenbaaer16-Nov-11 1:13 
AnswerSolution found PinmemberNasenbaaer16-Nov-11 22:56 
GeneralDirectory timestamp regex... Pinmembertherearefartoomanybens13-Dec-09 15:50 
GeneralError :Could not find file link.text Pinmembermassu23-Feb-09 3:25 
Generalfile transfer Pinmemberguptasahil198817-Feb-09 23:19 
QuestionCannot List FTP Directories PinmemberGulfraz Khan15-Dec-08 23:23 
GeneralDirectory Tree download.. PinmemberMember 439131128-Sep-08 20:08 
GeneralA comfortable FTP class in .NET PinmemberElmue27-Aug-08 13:16 
QuestionHow can i connect to\someFolder? Pinmemberipop007zZZ7-Jul-08 0:10 
AnswerRe: How can i connect to\someFolder? Pinmembertherearefartoomanybens13-Dec-09 10:44 
QuestionHow create directory Pinmemberalien25011-Sep-07 3:23 
AnswerRe: How create directory Pinmemberalien25011-Sep-07 4:17 
GeneralRe: How create directory PinmemberMember 281270421-Jun-11 3:11 
GeneralParent Directory PinmemberLava0413-Jun-07 1:24 
QuestionHow to move a file from one directory to another directory in ftp Pinmemberchandu.sanka28-Nov-06 3:17 
Questionhow to trace the target location directory Pinmemberchandu.sanka28-Nov-06 3:13 
Questionkcommon.dll Pinmember_anagram_1-Nov-06 3:32 
AnswerRe: kcommon.dll Pinmember_anagram_1-Nov-06 7:12 
QuestionRe: kcommon.dll Pinmemberalexander_z212-Jul-11 15:38 

I have an Error:

Error 1 The type or namespace name 'KCommon' could not be found (are you missing a using directive or an assembly reference?

Do you have this dll file?

Tank you.
Best Regards
QuestionHow to download from ftp server using VS2003 PinmemberRaju Sharma17-Oct-06 21:21 
Generalftp upload Pinmemberpreets30816-Jul-06 21:15 
GeneralCoping file to different directory in remote server Pinmemberjasocl3-Jul-06 23:11 
AnswerRe: Coping file to different directory in remote server Pinmemberstixoffire10-Apr-08 6:18 
GeneralUNIX regex's not recognising all files returned by LIST command - fix supplied here!! PinmemberStewart Rae8-May-06 16:58 
GeneralRe: UNIX regex's not recognising all files returned by LIST command - fix supplied here!! PinmemberShorin_gr15-Jun-06 5:14 
GeneralRe: UNIX regex's not recognising all files returned by LIST command - fix supplied here!! PinmemberAquaJo13-Jul-06 10:14 
GeneralRe: UNIX regex's not recognising all files returned by LIST command - fix supplied here!! Pinmemberjosias_c28-Oct-10 10:20 
GeneralRe: UNIX regex's not recognising all files returned by LIST command - fix supplied here!! Pinmemberlesnikowski4-Jan-11 8:39 
GeneralCannot connect .. Help !! PinmemberStar999919-Apr-06 18:18 
GeneralSubdirectory Pinmembernmbvc2-Mar-06 6:01 
GeneralRe: Subdirectory Pinmembertherearefartoomanybens13-Dec-09 15:51 
Questioncan't download demo file? PinsussAnonymous6-Oct-05 14:39 
GeneralHi Alex Pinmembersantosh poojari14-Sep-05 21:40 
GeneralHelp!! Problem Kcommon GetFile PinmemberJugkrit_Emp@hotmail.com22-Aug-05 22:07 
GeneralRe: Help!! Problem Kcommon GetFile PinsussAnonymous29-Aug-05 1:58 
Generalavoid blocking while reading response stream! Pinmember[pascal]17-Aug-05 5:59 
GeneralRe: avoid blocking while reading response stream! Pinmembercphexad13-Feb-07 4:44 
GeneralHi Help needed PinmemberNR_gopal3-Aug-05 2:40 
Generalunhandled exceptions Pinmember[pascal]27-Jul-05 7:24 
Generalpatch for linux ftp list parsing Pinmember[pascal]25-Jul-05 6:57 
GeneralRe: patch for linux ftp list parsing Pinmembercwetzelberger8-May-07 5:41 
Generaluploading images to ftp using files Pinmemberv.venkannababu5-Jun-05 0:44 
Generaldoesnt compile PinsussDavid Every3-Jun-05 13:20 
QuestionHow to use this coding in ASP.NET ?? Pinsusspathakmakrand@yahoo.com16-May-05 19:54 
GeneralUnix Regular Expression PinmemberSasquatP29-Mar-05 10:34 
GeneralVPN performance problem-design flaw Pinmemberfmoldoveanu21-Mar-05 14:28 
QuestionMultipel-files? Pinsussanonymous24-Feb-05 4:13 

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