C# .NET - Using HttpWebRequest to send POST data

Hello, I am trying to use HttpWebRequest to simulate sending some POST data from a form to a PHP script.
I have accomplished this using:
HttpWebRequest req = (HttpWebRequest) WebRequest.Create("http://mysite.com/index.php");
req.Method = "POST";
req.ContentType = "application/x-www-form-urlencoded";
string postData = "var=value1&var2;=value2"
req.ContentLength = postData.Length;
StreamWriter stOut = new StreamWriter(req.GetRequestStream(), System.Text.Encoding.ASCII);
stOut.Write(postData);
stOut.Close();
I have now ran into a problem when I am trying to upload a file. The PHP script expects a file uploaded from a form with the:
<input type="file">
object.
I have tried many things and can not figure out how to do this from C#. Any help is greatly appreciated!

Hi, try this solution. I have used it to upload files to a php Web shop. Any questions - better contact me directly - anefedov(a - t )list(dot)ru Sorry for silly antispan protection public override int uploadArticles() { try { WebRequest webRequest; WebResponse webResponse; DirectoryInfo di = new DirectoryInfo(getStoragePath(WebShopBrokerStatuses.PATH_STORAGE_ARTICLES)); FileInfo[] filist = di.GetFiles(); for (int ix = 0; ix < filist.Length; ix++) { webRequest = WebRequest.Create(OscUrl + "admin/easypopulate.php?split=0"); webRequest.Method = WebRequestMethods.Http.Post; webRequest.Headers.Add("Cookie", "osCAdminID=" + oscAdmCookie); webRequest.Headers.Add("Accept", "image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, application/x-ms-application, application/x-ms-xbap, application/vnd.ms-xpsdocument, application/xaml+xml, application/x-shockwave-flash, */*"); webRequest.Headers.Add("Referer", "http://localhost/OSC/admin/easypopulate.php"); webRequest.Headers.Add("Accept-Language", "ru"); string boundary = "---------------------------" + DateTime.Now.Ticks.ToString().Substring(0, 11); webRequest.ContentType = "multipart/form-data; boundary=" + boundary; StringBuilder content = new StringBuilder(); content.AppendLine(boundary); content.AppendLine("Content-Disposition: form-data; name=\"MAX_FILE_SIZE\""); content.AppendLine(""); content.AppendLine("100000000"); content.AppendLine(boundary); content.AppendLine("Content-Disposition: form-data; name=\"usrfl\"; filename=\""+filist[ix].FullName+"\""); content.AppendLine("Content-Type: application/vnd.ms-excel"); content.AppendLine(""); String fileContent = filist[ix].OpenText().ReadToEnd(); content.AppendLine(fileContent); content.AppendLine(boundary); content.AppendLine("Content-Disposition: form-data; name=\"imput_mode\""); content.AppendLine(""); content.AppendLine("normal"); content.AppendLine(boundary); content.AppendLine("Content-Disposition: form-data; name=\"buttoninsert\""); content.AppendLine(""); content.AppendLine("Insert into db"); content.AppendLine(boundary+"--"); byte[] data = System.Text.ASCIIEncoding.UTF8.GetBytes(content.ToString()); webRequest.ContentLength = data.Length; System.IO.Stream os = webRequest.GetRequestStream(); os.Write(data, 0, data.Length); os.Close(); /*FileInfo fi = new FileInfo("request.txt"); FileStream fs = fi.OpenWrite(); fs.Write(data, 0, data.Length); fs.Flush(); fs.Close();*/ webResponse = webRequest.GetResponse(); } } catch (Exception e) { return WebShopBrokerStatuses.ERROR_UPLOAD_ARTICLES; } return WebShopBrokerStatuses.SUCESS; }

public override int uploadArticles()
{
try
{
WebRequest webRequest;
WebResponse webResponse;
DirectoryInfo di = new DirectoryInfo(getStoragePath(WebShopBrokerStatuses.PATH_STORAGE_ARTICLES));
FileInfo[] filist = di.GetFiles();
for (int ix = 0; ix < filist.Length; ix++)
{
webRequest = WebRequest.Create(OscUrl + "admin/easypopulate.php?split=0");
webRequest.Method = WebRequestMethods.Http.Post;
webRequest.Headers.Add("Cookie", "osCAdminID=" + oscAdmCookie);
webRequest.Headers.Add("Accept", "image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, application/x-ms-application, application/x-ms-xbap, application/vnd.ms-xpsdocument, application/xaml+xml, application/x-shockwave-flash, */*");
webRequest.Headers.Add("Referer", "http://localhost/OSC/admin/easypopulate.php");
webRequest.Headers.Add("Accept-Language", "ru");
string boundary = "---------------------------" +
DateTime.Now.Ticks.ToString().Substring(0, 11);
webRequest.ContentType = "multipart/form-data; boundary=" + boundary;
StringBuilder content = new StringBuilder();
content.AppendLine(boundary);
content.AppendLine("Content-Disposition: form-data; name=\"MAX_FILE_SIZE\"");
content.AppendLine("");
content.AppendLine("100000000");
content.AppendLine(boundary);
content.AppendLine("Content-Disposition: form-data; name=\"usrfl\"; filename=\""+filist[ix].FullName+"\"");
content.AppendLine("Content-Type: application/vnd.ms-excel");
content.AppendLine("");
String fileContent = filist[ix].OpenText().ReadToEnd();
content.AppendLine(fileContent);
content.AppendLine(boundary);
content.AppendLine("Content-Disposition: form-data; name=\"imput_mode\"");
content.AppendLine("");
content.AppendLine("normal");
content.AppendLine(boundary);
content.AppendLine("Content-Disposition: form-data; name=\"buttoninsert\"");
content.AppendLine("");
content.AppendLine("Insert into db");
content.AppendLine(boundary+"--");
byte[] data = System.Text.ASCIIEncoding.UTF8.GetBytes(content.ToString());
webRequest.ContentLength = data.Length;
System.IO.Stream os = webRequest.GetRequestStream();
os.Write(data, 0, data.Length);
os.Close();
webResponse = webRequest.GetResponse();
}
}
catch (Exception e)
{
return
WebShopBrokerStatuses.ERROR_UPLOAD_ARTICLES;
}
return WebShopBrokerStatuses.SUCESS;
}