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    <p>I did this last year based upon some code that I found. It supports exactly what you want, both files and values.</p> <p>Here is the class called <code>HttpForm</code>:</p> <pre><code>public class HttpForm { private Dictionary&lt;string, string&gt; _files = new Dictionary&lt;string, string&gt;(); private Dictionary&lt;string, string&gt; _values = new Dictionary&lt;string, string&gt;(); public HttpForm(string url) { this.Url = url; this.Method = "POST"; } public string Method { get; set; } public string Url { get; set; } //return self so that we can chain public HttpForm AttachFile(string field, string fileName) { _files[field] = fileName; return this; } public HttpForm ResetForm(){ _files.Clear(); _values.Clear(); return this; } //return self so that we can chain public HttpForm SetValue(string field, string value) { _values[field] = value; return this; } public HttpWebResponse Submit() { return this.UploadFiles(_files, _values); } private HttpWebResponse UploadFiles(Dictionary&lt;string, string&gt; files, Dictionary&lt;string, string&gt; otherValues) { var req = (HttpWebRequest)WebRequest.Create(this.Url); req.Timeout = 10000 * 1000; req.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"; req.AllowAutoRedirect = false; var mimeParts = new List&lt;MimePart&gt;(); try { if (otherValues != null) { foreach (var fieldName in otherValues.Keys) { var part = new MimePart(); part.Headers["Content-Disposition"] = "form-data; name=\"" + fieldName + "\""; part.Data = new MemoryStream(Encoding.UTF8.GetBytes(otherValues[fieldName])); mimeParts.Add(part); } } if (files != null) { foreach (var fieldName in files.Keys) { var part = new MimePart(); part.Headers["Content-Disposition"] = "form-data; name=\"" + fieldName + "\"; filename=\"" + files[fieldName] + "\""; part.Headers["Content-Type"] = "application/octet-stream"; part.Data = File.OpenRead(files[fieldName]); mimeParts.Add(part); } } string boundary = "----------" + DateTime.Now.Ticks.ToString("x"); req.ContentType = "multipart/form-data; boundary=" + boundary; req.Method = this.Method; long contentLength = 0; byte[] _footer = Encoding.UTF8.GetBytes("--" + boundary + "--\r\n"); foreach (MimePart part in mimeParts) { contentLength += part.GenerateHeaderFooterData(boundary); } req.ContentLength = contentLength + _footer.Length; byte[] buffer = new byte[8192]; byte[] afterFile = Encoding.UTF8.GetBytes("\r\n"); int read; using (Stream s = req.GetRequestStream()) { foreach (MimePart part in mimeParts) { s.Write(part.Header, 0, part.Header.Length); while ((read = part.Data.Read(buffer, 0, buffer.Length)) &gt; 0) s.Write(buffer, 0, read); part.Data.Dispose(); s.Write(afterFile, 0, afterFile.Length); } s.Write(_footer, 0, _footer.Length); } var res = (HttpWebResponse)req.GetResponse(); return res; } catch (Exception ex) { Console.WriteLine(ex.Message); foreach (MimePart part in mimeParts) if (part.Data != null) part.Data.Dispose(); return (HttpWebResponse)req.GetResponse(); } } private class MimePart { private NameValueCollection _headers = new NameValueCollection(); public NameValueCollection Headers { get { return _headers; } } public byte[] Header { get; protected set; } public long GenerateHeaderFooterData(string boundary) { StringBuilder sb = new StringBuilder(); sb.Append("--"); sb.Append(boundary); sb.AppendLine(); foreach (string key in _headers.AllKeys) { sb.Append(key); sb.Append(": "); sb.AppendLine(_headers[key]); } sb.AppendLine(); Header = Encoding.UTF8.GetBytes(sb.ToString()); return Header.Length + Data.Length + 2; } public Stream Data { get; set; } } } </code></pre> <p>You can use it like this:</p> <pre><code>var file1 = @"C:\file"; var file2 = @"C:\file2"; var yourUrl = "http://yourdomain.com/process.php"; var httpForm = new HttpForm(yourUrl); httpForm.AttachFile("file1", file1).AttachFile("file2", file2); httpForm.setValue("foo", "some foo").setValue("blah", "rarrr!"); httpForm.Submit(); </code></pre> <p>Let me know if it works for you.</p>
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