public JObject PostBackStates()

        {

            JObject xState = null;

            if (Page.IsPostBack)

            {

                string state = HttpContext.Current.Request.Form["X_STATE"];

                string xstateURI = HttpContext.Current.Request.Form["X_STATE_URI"];

                if (!String.IsNullOrEmpty(state))

                {

                    state = String.IsNullOrEmpty(xstateURI) ? DecodeFrom64(state) : HttpUtility.UrlDecode(state);

                }

                state = String.IsNullOrEmpty(state) ? "{}" : state;

                xState = JObject.Parse(state);

            }

            return xState;

        }

        private string DecodeFrom64(string encodedData)

        {

            byte[] encodedDataAsBytes = System.Convert.FromBase64String(encodedData);

            return System.Text.UTF8Encoding.UTF8.GetString(encodedDataAsBytes);

        }

        private string EncodeTo64(string toEncode)

        {

            byte[] toEncodeAsBytes = System.Text.UTF8Encoding.UTF8.GetBytes(toEncode);

            return System.Convert.ToBase64String(toEncodeAsBytes);

        }