public async Task <ActionResult> RenameDesign(DesignRenameModel renameDesign)
        {
            var result = await DesignUserService.RenameDesignAsync(GetUserId(), renameDesign.DesignId, renameDesign.NewDesignName);

            if (!result)
            {
                throw new Exception("RenameDesignAsync failure.");
            }

            return(RedirectToAction("Index"));
        }