public static class WebApiConfig

{

    public static void Register(HttpConfiguration config)

    {

        config.Routes.MapHttpRoute(

            name: "DefaultApi",

            routeTemplate: "api/{controller}/{id}",

            defaults: new { id = RouteParameter.Optional }

        );

        var appXmlType = config.Formatters.XmlFormatter.SupportedMediaTypes.FirstOrDefault(t => t.MediaType == "application/xml");

        config.Formatters.XmlFormatter.SupportedMediaTypes.Remove(appXmlType);

    }

}