downloadOrder(orderId: number , userId : string) {

    this._http.get(this._config.getApiURI() + '/Download/productfile/' + orderId + '/' + userId, { observe: 'blob'})
      .subscribe(
        (data) => {
          if(this._functionService.isNullOrEmpty(data.body)){
            this._snackBarService.error('فایل پیدا نشد');
            return;
          }
          var contentType = data.body.type || "application/octet-stream";

          var fileInfo = JSON.parse(data.headers.get('FileInfo'));          
          var blob = new Blob([data.body], { type: contentType });
          var url = window.URL.createObjectURL(blob);
          var anchor = document.createElement("a");
          anchor.setAttribute("href", url)
          anchor.setAttribute("download", fileInfo.fileName + fileInfo.fileType);
          anchor.setAttribute("target", "_blank");
          document.body.appendChild(anchor);
          anchor.click();
          setTimeout(function () {
            document.body.removeChild(anchor);
            window.URL.revokeObjectURL(url);
          }, 200);
        },
        error => {
          this._snackBarService.error(error);
        });
  }

             while ((bytesRead = await stream.ReadAsync(buffer, 0, buffer.Length)) > 0)  
                    {                        
                        await Response.Body.WriteAsync(buffer);                        
                        //return File(buffer, GetContentType(fullPath), newFileName, true);                        
                        //return new FileStreamResult(stream,"application/octet-stream");
                    }