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    <p>I had to do the same thing on a project last year. After some looking around, I found this: </p> <p><a href="https://stackoverflow.com/questions/566462/upload-files-with-httpwebrequest-multipart-form-data/2996904#2996904">Upload files with HTTPWebrequest (multipart/form-data)</a></p> <p>The second answer in there should be what you're looking for. When I was trying to do this I ran into some trouble getting that exact method to work. The problem is that C#.NET does not have any support for multiple key/value pairs in a POST. So you must construct the HTTP request content header yourself. I believe the answer in the link above writes it directly to the request stream. I was able to convert the code found at the link below to build the header, and then wrote the bytes to the request stream.</p> <p><a href="http://code.activestate.com/recipes/146306-http-client-to-post-using-multipartform-data/" rel="nofollow noreferrer">http://code.activestate.com/recipes/146306-http-client-to-post-using-multipartform-data/</a></p> <p>My code looked something like the following (I've had to modify it below for readability because a lot of abstracted out as part of the whole project, so it may not be perfect syntactically).</p> <pre><code> public void BuildHeader(string contentType, string filename) { if ((contentType == null) || (contentType.Length == 0)) { contentType = "application/octet-stream"; } // Create the boundary string for the POST message header string boundary = "----------" + DateTime.Now.Ticks.ToString("x"); // Build up the POST message header StringBuilder sb = new StringBuilder(); // The specific format used can be found in the HTTP protocol specs. // The 'name' variable indicates the field-name, and the last variable // added to the string before another boundary is the value for that field. sb.Append("--"); sb.Append(boundary); sb.Append("\r\n"); sb.Append("Content-Disposition: form-data; name=\""); sb.Append("path"); sb.Append("\""); sb.Append("\r\n\r\n"); sb.Append(fileName); sb.Append("--"); sb.Append(boundary); sb.Append("\r\n"); sb.Append("Content-Disposition: form-data; name=\""); sb.Append("contents"); sb.Append("\"; fileName=\""); sb.Append("abc"); sb.Append("\""); sb.Append("\r\n"); sb.Append("Content-Type: "); sb.Append(contentType); sb.Append("\r\n"); sb.Append("\r\n"); using (Stream fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read)) { // Add the file contents to the POST message byte[] buffer = new Byte[checked((uint)Math.Min(4096, (int)fileStream.Length))]; int bytesRead = 0; while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0) { sb.Append(ASCIIEncoding.ASCII.GetString(buffer)); } // Get the byte array of the POST message, and its length string totalContents = sb.ToString(); byte[] totalUpload = Encoding.UTF8.GetBytes(totalContents); int length = totalUpload.Length; } } </code></pre> <p>Note that this only prepares a header for the upload of a single file.</p>
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