protected void Application_Start()
        {
            CustomToolchain.Register(); // if you need additional utility-like functions, register them here (insted of at models level)

            // !attributes registration done here: -------------------------------------------------------------------

            // required for client-side validation to be working, but redundant if built-in ea model validation provider is used (see statement below)
            // RegisterExpressiveAttributes();

            // ea model validation provider added here, it automatically registers adapters for expressive validation attributes and respects their processing priorities when validation is performed
            // RegisterExpressiveModelValidatorProvider();

            // just for demo, if you redefine attributes and validators, because you need to e.g. override global error messages, register them here as well
            // RegisterAdditionalExpressiveAttributes();

            // best way - write custom provider by inheriting from ExpressiveAnnotationsModelValidatorProvider, and do it all there (keeps priorities working everywhere)
            RegisterCustomExpressiveModelValidatorProvider();

            // !------------------------------------------------------------------------------------------------------

            AreaRegistration.RegisterAllAreas();

            GlobalConfiguration.Configure(WebApiConfig.Register);
            FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
            RouteConfig.RegisterRoutes(RouteTable.Routes);
            BundleConfig.RegisterBundles(BundleTable.Bundles);
        }
        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            else
            {
                app.UseExceptionHandler("/Home/Error");
                app.UseHsts();
            }

            app.UseHttpsRedirection();
            app.UseStaticFiles();
            app.UseSession();

            app.UseMvc(routes =>
            {
                routes.MapRoute(
                    name: "default",
                    template: "{controller=Home}/{action=Index}/{id?}");
            });

            CustomToolchain.Register();
        }