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POError while closing ftp stream in C#
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  1. POError while closing ftp stream in C#
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    copied!<p>I'm trying to cancel a downloading operation. My scenario is as follows:</p> <p>When the user clicks on Cancel Download Button so this action throws exception in Download function which is as follows:</p> <pre><code> try { reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + uri + "/" + fileName)); reqFTP.Method = WebRequestMethods.Ftp.DownloadFile; reqFTP.UseBinary = true; reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword); reqFTP.UsePassive = true; response = (FtpWebResponse)reqFTP.GetResponse(); ftpStream = response.GetResponseStream(); _isItOutputStream = true; string dataLengthString = response.Headers["Content-Length"]; int dataLength = 0; if (dataLengthString != null) { dataLength = Convert.ToInt32(dataLengthString); } long cl = response.ContentLength; int bufferSize = 4048; int readCount; byte[] buffer = new byte[bufferSize]; readCount = ftpStream.Read(buffer, 0, bufferSize); outputStream = new FileStream(filePath + "\\" + fileName, FileMode.Create); bool first = true; while (readCount &gt; 0) { outputStream.Write(buffer, 0, readCount); _actualDownloaded += readCount; if (this.InvokeRequired) { ProgressBarDel _progressDel = new ProgressBarDel(ProgressBar); this.Invoke(_progressDel, new object[] { _actualDownloaded, first }); } first = false; readCount = ftpStream.Read(buffer, 0, bufferSize); } ftpStream.Close(); outputStream.Close(); response.Close(); _isItOutputStream = false; return true; } catch (Exception ee) { _downloadException = ee.Message; if (response != null) { outputStream.Close(); ftpStream.Close(); response.Close(); } return false; } </code></pre> <p>In the line " <code>ftpStream.Close()</code> " here where the exception is thrown...</p> <p>The exception text is:</p> <blockquote> <p>The remote server returned an error: (450) File unavailable (e.g., file busy) </p> </blockquote> <p>where it opens a file to download as what i wrote " <code>outputStream = new FileStream(filePath + "\\" + fileName, FileMode.Create);</code>" i wont to close this stream and to close the response in order if the user did as follows: download -> cancel download -> download -> cancel download -> download </p> <p>if this scenario happened the application hungs up. i don't know how to close the stream and the response so i can stop downloading then delete the created file in order to download again.</p> <p>thnx</p>
 

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