Bonjour a tous

J'ai un petit souci de cookies sur une requete httpwebrequest, et je ne vois pas du tout d'ou cela peut provenir, j'aimerai donc un p'tit coup de main si des ames charitables ont un petit moment

Le script consiste a uploader un (ou plusieurs) fichiers images sur un site, ou un cookies est requis.
Pour cela je fais une premiere requete pour me logger, pas de souci a ce niveau là. J'enregistre ensuite mon cookies dans un cookiescontainer nommé cookies.
En revanche, apres je n'arrive pas a l'utiliser dans ma nouvelle requete.. j'ignore pourquoi.
Je vous met le code de ma nouvelle requete
Code : Sélectionner tout - Visualiser dans une fenêtre à part
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private void button4_Click(object sender, EventArgs e)
    {
 
 
 
 
        string url_upload_photos = "http://monsite.xxxx";
 
        int nbr_photos = 0;
        string[] files_photos = { "C:/1.jpg", "C:/2.jpg" };
 
 
 
 
 
                string entete_fichier = "";
                string boundary = "---------------------------" + DateTime.Now.Ticks.ToString("x", CultureInfo.InvariantCulture);
                HttpWebRequest httpWebRequest_upload = (HttpWebRequest)WebRequest.Create(url_upload_photos);
                httpWebRequest_upload.Method = "POST";
                httpWebRequest_upload.KeepAlive = true;
                httpWebRequest_upload.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
                httpWebRequest_upload.Referer = "http://monsite.xxxx";
                httpWebRequest_upload.UserAgent = "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; FDM; .NET4.0C; .NET4.0E)";
                httpWebRequest_upload.ContentType = "multipart/form-data; boundary=" + boundary;
                httpWebRequest_upload.ServicePoint.Expect100Continue = false;
                httpWebRequest_upload.CookieContainer = cookies;
 
 
                Stream memStream_upload = new System.IO.MemoryStream();
                string entete = "";
                byte[] boundarybytes = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "\r\n");
                memStream_upload.Write(boundarybytes, 0, boundarybytes.Length);
                byte[] headerbytes = System.Text.Encoding.ASCII.GetBytes(entete);
                memStream_upload.Write(headerbytes, 0, headerbytes.Length);
                entete_fichier = "Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\nContent-Type: image/jpeg\r\n\r\n";
                entete_fichier = string.Format(entete_fichier, "pictureUpload1", files_photos[nbr_photos]);
                FileStream fileStream_upload = new FileStream(files_photos[nbr_photos], FileMode.Open, FileAccess.Read);
                byte[] buffer = new byte[1024];
                int bytesRead = 0;
                byte[] headerbytes_0 = System.Text.Encoding.ASCII.GetBytes(entete_fichier);
                memStream_upload.Write(headerbytes_0, 0, headerbytes_0.Length);
 
                while ((bytesRead = fileStream_upload.Read(buffer, 0, buffer.Length)) != 0)
                {
                    memStream_upload.Write(buffer, 0, bytesRead);
                }
 
                memStream_upload.Write(boundarybytes, 0, boundarybytes.Length);
                string entete_suite = "";
                byte[] headerbytes_suite = System.Text.Encoding.ASCII.GetBytes(entete_suite);
 
                memStream_upload.Write(headerbytes_suite, 0, headerbytes_suite.Length);
 
                fileStream_upload.Close();
                nbr_photos++;
 
                httpWebRequest_upload.ContentLength = memStream_upload.Length;
                Stream requestStream_upload = httpWebRequest_upload.GetRequestStream();
                memStream_upload.Position = 0;
                byte[] tempBuffer = new byte[memStream_upload.Length];
                memStream_upload.Read(tempBuffer, 0, tempBuffer.Length);
                memStream_upload.Close();
                requestStream_upload.Write(tempBuffer, 0, tempBuffer.Length);
                requestStream_upload.Close();
                WebResponse webResponse_upload = httpWebRequest_upload.GetResponse();
 
                Stream stream_upload = webResponse_upload.GetResponseStream();
                StreamReader reader_upload = new StreamReader(stream_upload);
                string resultat = reader_upload.ReadToEnd();
 
                webResponse_upload.Close();
                httpWebRequest_upload = null;
                webResponse_upload = null;
 
 
 
 
        }