FTP Upload File Using Only .NET Framework

Here an example of how to upload a file to a FTP-server, using the class FtpWebRequest, which is included in the .NET Framework.

string ftpPath = string.Format("ftp://{0}/{1}", urlOrIpNumber, filePath);
FtpWebRequest request = (FtpWebRequest)WebRequest.Create(ftpPath);
request.Method = WebRequestMethods.Ftp.UploadFile;
request.Credentials = new NetworkCredential (userName, password);

byte[] fileContents = GetFileContent();
request.ContentLength = fileContents.Length;

using(var requestStream = request.GetRequestStream())
    requestStream.Write(fileContents, 0, fileContents.Length);

All you need to do is reference the System.Net namespace.

Update: Shorter code version

This code comes from Mads Kristensen, written in the middle of 2006.

private static void Upload(string ftpServer, string userName, string password, string filename)
   using (var client = new WebClient())
      client.Credentials = new NetworkCredential(userName, password);
      client.UploadFile(ftpServer + "/" + new FileInfo(filename).Name, "STOR", filename);

I'm not sure if there are any scenarios that this code doesn't work with.