Setup for using web api controllers in an Umbraco website. Code depends on two nuget packages: Microsoft.AspNet.WebApi and [WebActivator](https://github.com/davidebbo/WebActivator)

AppStart.cs

// Put this file in /App_Start
using Twins.UmbWebApi.App_Start;
using System.Web.Http;
using System.Web.Routing;

[assembly: WebActivator.PreApplicationStartMethod(typeof (AppStart), "RegisterRoutes")]
namespace YourProject.UmbWebApi.App_Start
{
    public class AppStart
    {
        public static void RegisterRoutes()
        {
            // Following line is a basic routing registration pointing all web api
            // controllers in the project at /umbapi/
            RouteTable.Routes.MapHttpRoute("RouteName", "umbapi/{controller}/{id}",
                                           new {id = RouteParameter.Optional});

        }
    }
}