Upload file to FTP site using VB.NET

Question

I have this working code from this link, to upload a file to an ftp site:

\' set up request...
Dim clsRequest As System.Net.FtpWebRequest = _
    DirectCast(         


        

Answer 1

Yes, FTP protocol overwrites existing files on upload.

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Note that there are better ways to implement the upload.

The most trivial way to upload a binary file to an FTP server using .NET framework is using WebClient.UploadFile:

Dim client As WebClient = New WebClient
client.Credentials = New NetworkCredential("username", "password")
client.UploadFile("ftp://ftp.example.com/remote/path/file.zip", "C:\local\path\file.zip")

If you need a greater control, that WebClient does not offer (like TLS/SSL encryption, etc), use FtpWebRequest. Easy way is to just copy a FileStream to FTP stream using Stream.CopyTo:

Dim request As FtpWebRequest =
    WebRequest.Create("ftp://ftp.example.com/remote/path/file.zip")
request.Credentials = New NetworkCredential("username", "password")
request.Method = WebRequestMethods.Ftp.UploadFile

Using fileStream As Stream = File.OpenRead("C:\local\path\file.zip"),
      ftpStream As Stream = request.GetRequestStream()
    fileStream.CopyTo(ftpStream)
End Using

If you need to monitor an upload progress, you have to copy the contents by chunks yourself:

Dim request As FtpWebRequest =
    WebRequest.Create("ftp://ftp.example.com/remote/path/file.zip")
request.Credentials = New NetworkCredential("username", "password")
request.Method = WebRequestMethods.Ftp.UploadFile

Using fileStream As Stream = File.OpenRead("C:\local\path\file.zip"),
      ftpStream As Stream = request.GetRequestStream()
    Dim read As Integer
    Do
        Dim buffer() As Byte = New Byte(10240) {}
        read = fileStream.Read(buffer, 0, buffer.Length)
        If read > 0 Then
            ftpStream.Write(buffer, 0, read)
            Console.WriteLine("Uploaded {0} bytes", fileStream.Position)
        End If
    Loop While read > 0
End Using

For GUI progress (WinForms ProgressBar), see C# example at:
How can we show progress bar for upload with FtpWebRequest

If you want to upload all files from a folder, see C# example at
Upload directory of files using WebClient.