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public void UploadPictures(string imagefile) 
{ 
 

            //read the image file as a byte array

            System.IO.FileStream fs = new System.IO.FileStream(imagefile, FileMode.Open,FileAccess.Read); 
            fs.Seek(0, SeekOrigin.Begin); 
            System.IO.BinaryReader br = new System.IO.BinaryReader(fs);

            byte[] image = br.ReadBytes((int)fs.Length);

            br.Close();

            fs.Close();

 

            HttpWebRequest req = (HttpWebRequest)WebRequest.Create("https://api.ebay.com/ws/api.dll");

            HttpWebResponse resp = null;

 

            string boundary = "MIME_boundary";

            string CRLF = " ";

           

            //Add the request headers

            req.Headers.Add("X-EBAY-API-COMPATIBILITY-LEVEL", "515");

            req.Headers.Add("X-EBAY-API-DEV-NAME", "devid");             //use your devid

            req.Headers.Add("X-EBAY-API-APP-NAME", "appid");             //use your appid

            req.Headers.Add("X-EBAY-API-CERT-NAME", "certid");          //use your certid

            req.Headers.Add("X-EBAY-API-SITEID", "0");

            req.Headers.Add("X-EBAY-API-DETAIL-LEVEL", "0");

            req.Headers.Add("X-EBAY-API-CALL-NAME", "UploadSiteHostedPictures");

            req.ContentType = "multipart/form-data; boundary=" + boundary;

       

            //set the method to POST

            req.Method = "POST";

            //set the HTTP version to 1.0

            req.ProtocolVersion = HttpVersion.Version10;

 

            //replace token with your own token

            string token = "token";

            //Construct the request 
           string strReq1 = "--" + boundary + CRLF

                            + "Content-Disposition: form-data; name=document" + CRLF

                            + "Content-Type: text/xml; charset="UTF-8"" + CRLF + CRLF

                            + "<?xml version="1.0" encoding="utf-8"?>"

                            + "<UploadSiteHostedPicturesRequest xmlns="urn:ebay:apis:eBLBaseComponents">"

                            + "<RequesterCredentials>"

                            + "<eBayAuthToken>" + token + "</eBayAuthToken>"

                            + "</RequesterCredentials>"

                            + "</UploadSiteHostedPicturesRequest>"

                            + CRLF + "--" + boundary + CRLF

                            + "Content-Disposition: form-data; name=image; filename=image" + CRLF

                            + "Content-Type: application/octet-stream" + CRLF

                            + "Content-Transfer-Encoding: binary" + CRLF + CRLF; 
 

           string strReq2 = CRLF + "--" + boundary + "--" + CRLF;

 

            //Convert the string to a byte array 
            byte[] postDataBytes1 = System.Text.Encoding.ASCII.GetBytes(strReq1); 
            byte[] postDataBytes2 = System.Text.Encoding.ASCII.GetBytes(strReq2); 

            int len = postDataBytes1.Length + postDataBytes2.Length + image.Length; 
            req.ContentLength = len; 
 

            //Post the request to eBay 
            System.IO.Stream requestStream = req.GetRequestStream(); 
            requestStream.Write(postDataBytes1, 0, postDataBytes1.Length); 
            requestStream.Write(image, 0, image.Length); 
            requestStream.Write(postDataBytes2, 0, postDataBytes2.Length); 
            requestStream.Close();

 

            string response;

            try

            {

                // get response and write to console

                resp = (HttpWebResponse)req.GetResponse();

                StreamReader responseReader = new StreamReader(resp.GetResponseStream(),Encoding.UTF8);

                response = responseReader.ReadToEnd();

                resp.Close();

 

                //response contains our pictures url

                System.Xml.XmlDocument xml = new System.Xml.XmlDocument();

                xml.LoadXml(response);

 

                //Extract the FullURL from the response

                System.Xml.XmlNodeList list = xml.GetElementsByTagName("FullURL","urn:ebay:apis:eBLBaseComponents");

                string fullURL = list[0].InnerText;

 

                //Get the other elements from the response if required

            }

            catch (Exception ex)

            {

                //handle exception

                response = ex.Message;

            }