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    <p>This is a known <a href="http://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=470465" rel="nofollow noreferrer">bug</a> in the WebClient class. It will be fixed in .NET 4.0. Until then you could use <a href="http://msdn.microsoft.com/en-us/library/system.net.httpwebrequest.aspx" rel="nofollow noreferrer">HttpWebRequest</a> to implement this functionality.</p> <hr> <p>UPDATE: Here's an example of using synchronous HttpWebRequest to upload a file and track the progress:</p> <pre><code>public sealed class Uploader { public const int CHUNK_SIZE = 1024; // 1 KB public void Upload(string url, string filename, Stream streamToUpload, Action&lt;int&gt; progress) { var request = (HttpWebRequest)WebRequest.Create(url); request.Method = "POST"; string boundary = string.Format("---------------------{0}", DateTime.Now.Ticks.ToString("x")); request.ContentType = string.Format("multipart/form-data; boundary={0}", boundary); request.KeepAlive = true; using (var requestStream = request.GetRequestStream()) { var header = string.Format("--{0}\r\nContent-Disposition: form-data; name=\"file\"; filename=\"{1}\"\r\nContent-Type: application/octet-stream\r\n\r\n", boundary, filename); var headerBytes = Encoding.ASCII.GetBytes(header); requestStream.Write(headerBytes, 0, headerBytes.Length); byte[] buffer = new byte[CHUNK_SIZE]; int bytesRead; long total = streamToUpload.Length; long totalBytesRead = 0; while ((bytesRead = streamToUpload.Read(buffer, 0, buffer.Length)) &gt; 0) { totalBytesRead += bytesRead; progress((int)(100 * totalBytesRead / total)); byte[] actual = new byte[bytesRead]; Buffer.BlockCopy(buffer, 0, actual, 0, bytesRead); requestStream.Write(actual, 0, actual.Length); } } using (var response = request.GetResponse()) { } } } class Program { static void Main(string[] args) { var url = "http://localhost:2141/Default.aspx"; var filename = "1.dat"; var uploader = new Uploader(); using (var fileStream = new FileStream(filename, FileMode.Open, FileAccess.Read, FileShare.ReadWrite)) { uploader.Upload(url, filename, fileStream, progress =&gt; Console.WriteLine("{0}% of \"{1}\" uploaded to {2}", progress, filename, url)); } } } </code></pre>
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    1. USDarin Dimitrov
    1. USDarin Dimitrov
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    1. VO
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      1. VTUpMod
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      1. This table or related slice is empty.
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    1. COUsing HttpWebRequest could have progress change information as callback?
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      1. USGeorge2
    2. COUpdated my post to include a sample using HttpWebRequest to upload a file to a given url and track progress in a callback.
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      1. USDarin Dimitrov
    3. COIs the byte[] actual variable needed? Couldn't you just call requestStream.Write(buffer, 0, bytesRead) and avoid the memory allocation and buffer copy?
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      1. USGuyIncognito
 

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