How to mimic POST method with payload in the same frame?

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C#

Hi,

I'm trying to mimic a http POST request like the one below, called by FireFox in a single frame (copied from Microsoft Network Manager)

- Http: Request, POST /popup_delete.php, Query:id=11598
    Command: POST
  - URI: /popup_delete.php?id=11598
     Location: /popup_delete.php
   - Parameters: 0x1
      id: 11598
    ProtocolVersion: HTTP/1.1
    Host:  mywebsite.com
    UserAgent:  Mozilla/5.0 (Windows NT 6.1; WOW64; rv:18.0) Gecko/20100101 Firefox/18.0
    Accept:  text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
    Accept-Language:  en-US,en;q=0.5
    Accept-Encoding:  gzip, deflate
    Referer:  http://mywebsite.com/popup_delete.php?id=11598
  - Cookie:  PHPSESSID=qq38t431qmcnb0kon93pt8u9t3; BIGipServeredms_80=307931328.20480.0000; authchallenge=8443ef4fe946eb285e0d9426f622b122
      PHPSESSID: qq38t431qmcnb0kon93pt8u9t3
      BIGipServeredms_80: 307931328.20480.0000
      authchallenge: 8443ef4fe946eb285e0d9426f622b122

    Connection:  keep-alive
  - ContentType:  application/x-www-form-urlencoded
     MediaType:  application/x-www-form-urlencoded
    ContentLength:  15
    HeaderEnd: CRLF
  - payload: HttpContentType =  application/x-www-form-urlencoded
     confirm: Confirm

so I wrote this..

//CookieAwareClient inherited from WebClient. I'm using it to keep the cookie. Login is successful.
var client = new CookieAwareWebClient();
client.BaseAddress = @"http://mywebsite.com";
var loginData = new NameValueCollection();
loginData.Add("id", "myusername");
loginData.Add("password", "mypassword");
client.UploadValues("sign_in.php?", "POST", loginData);
//end login

string RouteID = "11598";
var deleteData = new NameValueCollection();
deleteData.Add("confirm", "Confirm");

string DeleteURI = string.Format("popup_delete.php?id={0}", routeID);
client.Headers.Add("Referer", string.Format("http://mywebsite.com/{0}", DeleteURI));
client.UploadValues(DeleteURI, "POST", deleteData);

resulted in this frame..

- Http: Request, POST /popup_delete.php, Query:id=11598
    Command: POST
  - URI: /popup_delete.php?id=11598
     Location: /popup_delete.php
  - Parameters: 0x1
     id: 11598
    ProtocolVersion: HTTP/1.1
  - ContentType:  application/x-www-form-urlencoded
     MediaType:  application/x-www-form-urlencoded
    Referer:  http://mywebsite.com/popup_delete.php?id=11598
    Host:  mywebsite.com
  - Cookie:  PHPSESSID=pdoev4k0gq8ddg3gvidhuqkb14; BIGipServeredms_80=307931328.20480.0000
      PHPSESSID: pdoev4k0gq8ddg3gvidhuqkb14
      BIGipServeredms_80: 307931328.20480.0000

    ContentLength:  15
    Connection:  Keep-Alive
    HeaderEnd: CRLF

and later this frame..

- Http: HTTP Payload, URL: /popup_delete.php
  - payload: HttpContentType =  application/x-www-form-urlencoded
     confirm: Confirm

In Firefox, payload was sent in the same frame but in my code, payload was sent in the next frame. I'm trying to delete an entry by mimicking what Firefox is sending. At the moment, my method is not successful.