public PostingController(IPostingRepository postingRepository, IChannelRepository channelRepository, ITemplateRepository templateRepository)
 {
     this.postingRepository = postingRepository;
     this.channelRepository = channelRepository;
     this.templateRepository = templateRepository;
 }
 public PostingController(IPostingRepository postingRepository, IChannelRepository channelRepository, ITemplateRepository templateRepository)
 {
     this.postingRepository  = postingRepository;
     this.channelRepository  = channelRepository;
     this.templateRepository = templateRepository;
 }
        /*

        //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
        The following section preceded the introduction of Simple Injector IoC. Simple Injector requires
        a public constructor to exist but can be configured to restrict use of class as a singleton - see global.asax
        //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

        // explicit private constructor to prevent other classes creating instances
        private PostingService(IPostingRepository _repository)
        {
            repository = _repository;
        }

        public static PostingService Instance
        {
            get
            {
                // ensures thread safety
                lock (padlock)
                {
                    if (instance == null)
                    {
                        instance = new PostingService(new PostingRepository()); // site of injection?
                    }
                    return instance;
                }
            }
        }
        */
        /// <summary>
        /// public constructor intended to be used with singleton configuration by DI framework
        /// </summary>
        /// <param name="_repository"></param>
        public PostingService(IPostingRepository _repository)
        {
            repository = _repository;
        }