HttpWebRequest Post запрос с разделителем и файлом

var boundary = new string('-', 27) + DateTime.Now.Ticks.ToString("x", NumberFormatInfo.InvariantInfo);
var boundary2 = new string('-', 27) + DateTime.Now.Ticks.ToString();

byte[] file = (byte[])reader[2];
StringBuilder sb = new StringBuilder();
sb.AppendLine(boundary2);
sb.AppendLine("Content-Disposition: form-data; name="FILE"; filename="" + reader[1].ToString() + """);
sb.AppendLine("Content-Type: " + getMimeFromFile(file));
sb.AppendLine("");
byte[] nachalo = Encoding.ASCII.GetBytes(sb.ToString());
boundary = "--" + boundary2;
StringBuilder sb2 = new StringBuilder();
sb2.AppendLine(boundary);
sb2.AppendLine("Content-Disposition: form-data; name="PFTYPPE_ID"");
sb2.AppendLine("3");
sb2.AppendLine(boundary);
sb2.AppendLine("Content-Disposition: form-data; name="DESCRIPTION"");
sb2.AppendLine("1 ");
sb2.AppendLine(boundary);
sb2.AppendLine("Content-Disposition: form-data; name="DOC_ID"");
sb2.AppendLine(Number);
sb2.AppendLine(boundary + "--");                            
byte[] konec = Encoding.ASCII.GetBytes(sb2.ToString());
byte[] res = nachalo.Concat(file).Concat(konec).ToArray();

        public void HttpUploadFile(string url, string file, string paramName, string contentType, NameValueCollection nvc)
        {
            string boundary = "---------------------------" + DateTime.Now.Ticks.ToString("x");
            byte[] boundarybytes = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "\r\n");
 
            HttpWebRequest wr = (HttpWebRequest)WebRequest.Create(url);
            wr.ContentType = "multipart/form-data; boundary=" + boundary;
            wr.Method = "POST";
            wr.KeepAlive = true;
            wr.Credentials = System.Net.CredentialCache.DefaultCredentials;
            wr.CookieContainer = cookies;
            Stream rs = wr.GetRequestStream();
            string formdataTemplate = "Content-Disposition: form-data; name="{0}"\r\n\r\n{1}";
            foreach (string key in nvc.Keys)
            {
                rs.Write(boundarybytes, 0, boundarybytes.Length);
                string formitem = string.Format(formdataTemplate, key, nvc[key]);
                byte[] formitembytes = System.Text.Encoding.UTF8.GetBytes(formitem);
                rs.Write(formitembytes, 0, formitembytes.Length);
            }
            rs.Write(boundarybytes, 0, boundarybytes.Length);
            string headerTemplate = "Content-Disposition: form-data; name="{0}"; filename="{1}"\r\nContent-Type: {2}\r\n\r\n";
            string header = string.Format(headerTemplate, paramName, file, contentType);
            byte[] headerbytes = System.Text.Encoding.UTF8.GetBytes(header);
            rs.Write(headerbytes, 0, headerbytes.Length);
            FileStream fileStream = new FileStream(file, FileMode.Open, FileAccess.Read);
            byte[] buffer = new byte[4096];
            int bytesRead = 0;
            while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)
            {
                rs.Write(buffer, 0, bytesRead);
            }
            fileStream.Close();
            byte[] trailer = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "--\r\n");
            rs.Write(trailer, 0, trailer.Length);
            rs.Close();
            WebResponse wresp = null;
            try
            {
                wresp = wr.GetResponse();
                Stream stream2 = wresp.GetResponseStream();
                StreamReader reader2 = new StreamReader(stream2);
                var result = reader2.ReadToEnd();
                string rss = result.ToString();
            }
            catch (Exception ex)
            {
                MessageBox.Show("Error occurred while converting file", "Error!");
                if (wresp != null)
                {
                    wresp.Close();
                    wresp = null;
                }
            }
            finally
            {
                wr = null;
            }
        }

NameValueCollection parameters = new NameValueCollection();
parameters.Add("PFTYPPE_ID", "3");
parameters.Add("DESCRIPTION", " ");
parameters.Add("DOC_ID", Number);
string fullPath = Path.GetFullPath(reader[3].ToString());
string MIME = GetMimeType(reader[2].ToString());
HttpUploadFile("http://url", fullPath, "FILE", MIME , parameters);