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    <p>Ok here is what you could try. This code is not tested. So if it contains errors and you get it work please edit answer or point me to mistakes.</p> <pre><code>static void chunkCopyFile(string source, string destination, int bytesPerChunk) { uint bytesRead = 0; //Instead of this: //using (FileStream fs = new FileStream(source, FileMode.Open, FileAccess.Read)) { //...some necessary stuff... FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp://www.contoso.com/test.htm"); request.Method = WebRequestMethods.Ftp.DownloadFile; request.Credentials = new NetworkCredential ("anonymous","janeDoe@contoso.com"); FtpWebResponse response = (FtpWebResponse)request.GetResponse(); //Use this: using(Stream fs = response.GetResponseStream()){ using (BinaryReader br = new BinaryReader(fs)) { using (FileStream fsDest = new FileStream(destination, FileMode.Create)) { BinaryWriter bw = new BinaryWriter(fsDest); long cl = response.ContentLength;         int bufferSize = 2048;         int readCount;         byte[] buffer = new byte[bufferSize];       readCount = fs.Read(buffer, 0, bufferSize);         while (readCount &gt; 0)         { bw.Write(buffer, 0, readCount);             readCount = fs.Read(buffer, 0, bufferSize); updateProgress(readCount);         } } } } } </code></pre> <p>References:</p> <p><a href="http://msdn.microsoft.com/en-us/library/ms229711" rel="nofollow">http://msdn.microsoft.com/en-us/library/ms229711</a></p> <p><a href="http://www.codeproject.com/Articles/17202/Simple-FTP-demo-application-using-C-Net-2-0" rel="nofollow">http://www.codeproject.com/Articles/17202/Simple-FTP-demo-application-using-C-Net-2-0</a> (Download method code)</p>
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    1. COThe line "buffer = br.ReadBytes(bytesPerChunk) throws an exception: "This stream does not support seek operations."
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    2. COI updated answer. I also added reference where you could see all download code. Sorry I cant test code right now :(
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    3. COGot it working based on what you gave, final code is in the question! Thanks :)
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