Routing is not specific to the MVC framework. It can be used with ASP.NET Webform application or MVC application. ASP.NET introduced Routing to eliminate the needs of mapping each URL with a physical file. Routing enables us to define a URL pattern that maps to the request handler.

Configure a Route

Every MVC application must configure (register) at least one route configured by the MVC framework by default. You can register a route in RouteConfig class, which is in RouteConfig.cs under App_Start folder. The following figure illustrates how to configure a route in the RouteConfig class .

Route Constraints

You can also apply restrictions on the value of the parameter by configuring route constraints. For example, the following route applies a limitation on the id parameter that the id's value must be numeric.

Register Routes

After configuring all the routes in the RouteConfig class, you need to register it in the Application_Start()event in the Global.asax so that it includes all your routes into the RouteTable.