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    copied!<p>To answer your question regarding a HTTP post (with attachment), its much tougher - because of the attachments. This is the actual code I use to post images to FaceBook. </p> <pre><code> /// &lt;summary&gt; /// Create a new HttpWebRequest with the default properties for HTTP POSTS /// &lt;/summary&gt; /// &lt;param name="url"&gt;The URL to be posted to&lt;/param&gt; /// &lt;param name="referer"&gt;The refer&lt;/param&gt; /// &lt;param name="cookies"&gt;CookieContainer that should be used in this request&lt;/param&gt; /// &lt;param name="postData"&gt;The post data&lt;/param&gt; private string CreateHttpWebUploadRequest(string url, string referer, CookieContainer cookies, NameValueCollection postData, FileInfo fileData, string fileContentType) { HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url); string boundary = "----------" + DateTime.UtcNow.Ticks.ToString("x", CultureInfo.InvariantCulture); // set the request variables request.Method = WebRequestMethods.Http.Post; request.ContentType = "multipart/form-data; boundary=" + boundary; request.CookieContainer = cookies; request.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/533.4 (KHTML, like Gecko) Chrome/5.0.375.55 Safari/533.4"; request.Accept = "image/gif, image/jpeg, image/pjpeg, image/pjpeg, */*"; request.Headers.Add("Accept-Encoding: gzip,deflate"); request.AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip; request.Headers.Add("Accept-Language: en-us"); request.Referer = referer; request.KeepAlive = true; request.AllowAutoRedirect = false; // process through the fields StringBuilder sbHeader = new StringBuilder(); // add form fields, if any if (postData != null) { foreach (string key in postData.AllKeys) { string[] values = postData.GetValues(key); if (values != null) { foreach (string value in values) { if (!string.IsNullOrEmpty(value)) sbHeader.AppendFormat("--{0}\r\n", boundary); sbHeader.AppendFormat("Content-Disposition: form-data; name=\"{0}\";\r\n\r\n{1}\r\n", key, value); } } } } if (fileData != null) { sbHeader.AppendFormat("--{0}\r\n", boundary); sbHeader.AppendFormat("Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\n", "media", fileData.Name); sbHeader.AppendFormat("Content-Type: {0}\r\n\r\n", fileContentType); } byte[] header = Encoding.UTF8.GetBytes(sbHeader.ToString()); byte[] footer = Encoding.UTF8.GetBytes("\r\n--" + boundary + "--\r\n"); long contentLength = header.Length + (fileData != null ? fileData.Length : 0) + footer.Length; // set content length request.ContentLength = contentLength; using (Stream requestStream = request.GetRequestStream()) { requestStream.Write(header, 0, header.Length); // write the uploaded file if (fileData != null) { // write the file data, if any byte[] buffer = new Byte[fileData.Length]; var bytesRead = fileData.OpenRead().Read(buffer, 0, (int)(fileData.Length)); requestStream.Write(buffer, 0, bytesRead); } // write footer requestStream.Write(footer, 0, footer.Length); requestStream.Flush(); requestStream.Close(); using (var response = request.GetResponse() as HttpWebResponse) { using (var stIn = new System.IO.StreamReader(response.GetResponseStream())) { return stIn.ReadToEnd(); } } } } </code></pre> <p><strong>Update</strong> And to make it complete, here is the code for posts without the need for a file attachment. Again, I use this code to post to FaceBook. </p> <pre><code> /// &lt;summary&gt; /// Create a new HttpWebRequest with the default properties for HTTP POSTS /// &lt;/summary&gt; /// &lt;param name="url"&gt;The URL to be posted to&lt;/param&gt; /// &lt;param name="referer"&gt;The refer&lt;/param&gt; /// &lt;param name="cookies"&gt;CookieContainer that should be used in this request&lt;/param&gt; /// &lt;param name="postData"&gt;The post data (needs to be formatted in name=value&amp; format&lt;/param&gt; private string CreateHttpWebPostRequest(string url, string referer, CookieContainer cookies, NameValueCollection postData) { var sbPostData = new StringBuilder(); if (postData != null) { foreach (string key in postData.AllKeys) { string[] values = postData.GetValues(key); if (values != null) { foreach (string value in values) { if (!string.IsNullOrEmpty(value)) sbPostData.Append(string.Format("{0}={1}&amp;", HttpUtility.UrlEncode(key), HttpUtility.UrlEncode(value))); } } } } var parameterString = Encoding.UTF8.GetBytes(sbPostData.ToString()); HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url); request.Method = WebRequestMethods.Http.Post; request.CookieContainer = cookies; request.ContentLength = parameterString.Length; request.ContentType = "application/x-www-form-urlencoded"; request.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/533.4 (KHTML, like Gecko) Chrome/5.0.375.55 Safari/533.4"; request.Accept = "image/gif, image/jpeg, image/pjpeg, image/pjpeg, */*"; request.Headers.Add("Accept-Encoding: gzip,deflate"); request.AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip; request.Headers.Add("Accept-Language: en-us"); request.Referer = referer; request.KeepAlive = true; request.AllowAutoRedirect = false; using (Stream requestStream = request.GetRequestStream()) { requestStream.Write(parameterString, 0, parameterString.Length); requestStream.Close(); using (var response = request.GetResponse() as HttpWebResponse) { using (var stIn = new System.IO.StreamReader(response.GetResponseStream())) { return stIn.ReadToEnd(); } } } } </code></pre>
 

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