Write REST Web API

Attribute routing - More Control the Web API URL.

URL : /customers/1/orders

[Route("customers/{customerId}/orders")]
public IEnumerable<Order> GetOrdersByCustomer(int customerId) { ... }

(1)Enabling Attribute Routing 

(2)Convention-based

public static class WebApiConfig
{
    public static void Register(HttpConfiguration config)
    {
        // Attribute routing.
        config.MapHttpAttributeRoutes();  (1)

        // Convention-based routing.
        config.Routes.MapHttpRoute(        (2)
            name: "DefaultApi",
            routeTemplate: "api/{controller}/{id}",
            defaults: new { id = RouteParameter.Optional }
        );
    }
}