How can we show progress bar for upload with FtpWebRequest

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The easiest is to use BackgroundWorker and put your code into DoWork event handler. And report progress with BackgroundWorker.ReportProgress.

The basic idea:

private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
    var ftpWebRequest = (FtpWebRequest)WebRequest.Create("ftp://example.com");
    ftpWebRequest.Method = WebRequestMethods.Ftp.UploadFile;
    using (var inputStream = File.OpenRead(fileName))
    using (var outputStream = ftpWebRequest.GetRequestStream())
    {
        var buffer = new byte[1024 * 1024];
        int totalReadBytesCount = 0;
        int readBytesCount;
        while ((readBytesCount = inputStream.Read(buffer, 0, buffer.Length)) > 0)
        {
            outputStream.Write(buffer, 0, readBytesCount);
            totalReadBytesCount += readBytesCount;
            var progress = totalReadBytesCount * 100.0 / inputStream.Length;
            backgroundWorker1.ReportProgress((int)progress);
        }
    }
}

private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
    progressBar.Value = e.ProgressPercentage;
}

Make sure WorkerReportsProgress is enabled

backgroundWorker2.WorkerReportsProgress = true;

With BackgroundWorker you can also easily implement upload cancellation.

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