//dropbox connection
        private DropboxClient DropboxConnection()
        {
            var checkdropboxauth = db.GetDropboxInfoBySiteCoID(siteusercompanyid).FirstOrDefault();

            if (checkdropboxauth != null)
            {
                var dbx = new DropboxClient(System.Text.Encoding.UTF8.GetString(checkdropboxauth.Token));
                return(dbx);
            }
            else
            {
                return(null);
            }
        }