/// <summary>

        /// Register dependencies

        /// </summary>

        /// <param name="config">Config</param>

        protected virtual void RegisterDependencies(NopConfig config)

        {

            var builder = new ContainerBuilder();

            var container = builder.Build();

            this._containerManager = new ContainerManager(container);

            //we create new instance of ContainerBuilder

            //because Build() or Update() method can only be called once on a ContainerBuilder.

            //dependencies

            var typeFinder = new WebAppTypeFinder();

            builder = new ContainerBuilder();

            builder.RegisterInstance(config).As<NopConfig>().SingleInstance();

            builder.RegisterInstance(this).As<IEngine>().SingleInstance();

            builder.RegisterInstance(typeFinder).As<ITypeFinder>().SingleInstance();

            builder.Update(container);

            //register dependencies provided by other assemblies

            builder = new ContainerBuilder();

            var drTypes = typeFinder.FindClassesOfType<IDependencyRegistrar>();

            var drInstances = new List<IDependencyRegistrar>();

            foreach (var drType in drTypes)

                drInstances.Add((IDependencyRegistrar) Activator.CreateInstance(drType));

            //sort

            drInstances = drInstances.AsQueryable().OrderBy(t => t.Order).ToList();

            foreach (var dependencyRegistrar in drInstances)

                dependencyRegistrar.Register(builder, typeFinder, config);

            builder.Update(container);

            //set dependency resolver

            DependencyResolver.SetResolver(new AutofacDependencyResolver(container));

        }

        #endregion