public void BoxListFolders(BoxFileEntry fileEntry)
 {
     if (!OAuth2Info.CheckOAuth(Config.BoxOAuth2Info))
     {
         MessageBox.Show(Resources.UploadersConfigForm_ListFolders_Authentication_required_, Resources.UploadersConfigForm_BoxListFolders_Box_refresh_folders_list_failed,
             MessageBoxButtons.OK, MessageBoxIcon.Warning);
     }
     else
     {
         Box box = new Box(Config.BoxOAuth2Info);
         BoxFileInfo files = box.GetFiles(fileEntry);
         if (files != null && files.entries != null && files.entries.Length > 0)
         {
             foreach (BoxFileEntry folder in files.entries.Where(x => x.type == "folder"))
             {
                 BoxAddFolder(folder);
             }
         }
     }
 }