public async Task <IActionResult> UpdateValue(UpdateValueModel model)
        {
            var currentUser = await _userManager.GetUserAsync(User);

            if (currentUser == null)
            {
                return(Challenge());
            }
            if (String.IsNullOrEmpty(model?.Value))
            {
                return(Json("Empty String"));
            }

            var succeeded = await _appService.UpdateValueOfVariableAsync(currentUser, model);

            return(Json(new { success = succeeded }));
        }