A .NET consumer for app config hosted in a remote CMS server - see http://geekswithblogs.net/EltonStoneman/archive/2014/06/04/using-cms-for-app-configurationndashpart-1-deploy-umbraco.aspx

Config.cs

using Newtonsoft.Json.Linq;
using System;
using System.Configuration;
using System.Net;
using System.Runtime.Caching;
using System.Xml;

namespace Api.Core
{
    /// <summary>
    /// Dynamic representation of remote JSON app config
    /// </summary>
    /// <remarks>
    /// Add the config API url to appSettings, e.g. key="ApiConfig.Url" value="http://config.xyz.com/myapp"
    /// This example uses the config to determine how long to cache config. Expects an xs:duration 
    /// string in the property "caching.configLifespan", e.g. "PT30S" = 30 seconds
    /// </remarks>
    public class Config
    {
        private static MemoryCache _Cache = new MemoryCache("_Config");
        private static readonly string _ConfigUrl;

        static Config()
        {
            _ConfigUrl = ConfigurationManager.AppSettings["ApiConfig.Url"];
        }

        public static dynamic Current
        {
            get
            {
                EnsureConfig();
                return (JObject)_Cache["Current"];
            }
        }

        private static void EnsureConfig()
        {
            if (_Cache["Current"] == null)
            {
                using (var client = new WebClient())
                {
                    client.Headers.Add("accept", "application/json");
                    var json = client.DownloadString(_ConfigUrl);
                    dynamic config = JObject.Parse(json);
                    var cacheLifespan = XmlConvert.ToTimeSpan((string)config.caching.configLifespan);
                    _Cache.Add("Current", config, new CacheItemPolicy 
                    { 
                        AbsoluteExpiration = DateTimeOffset.Now.Add(cacheLifespan)
                    });
                }
            }
        }
    }
}