Folder structure in MVC

The use of App_Start() folder in MVC?

 There are 5 files in this folder.

1. AuthConfig
2. BundleConfig,
3. FilterConfig,
4. RouteConfig,
5. WebApiConfig.

AuthConfig

Used to configure security settings, including sites for OAuth login.

BundleConfig.cs:

This is used to create and register bundles for CS and JS files.By default various bundles are added in this file including jQuery,jQueryUI,jQuery validation,Modernizr and Site CSS..

FilterConfig.cs-

This is used to create and register global MVC filter error filter,action filter etc.By default it contains HandleErrorAttribute filter.

RouteConfig.cs-

This is used to register various route patterns for your Asp.Net MVC application. By default, one route is registered here named as Default Route.

WebApiConfig.cs-

This is used to register various WEB API routes like Asp.Net MVC, as well as set any additional WEB API configurations settings.