How to start and stop web api when self host in windows service

windows service has start and stop function. from win service start function we like to start web api like this way

string baseAddress = "http://localhost:9000/";

            // Start OWIN host 
            using (WebApp.Start<Startup>(url: baseAddress))
            {
                // Create HttpCient and make a request to api/values 
                HttpClient client = new HttpClient();
                HttpResponseMessage response = client.GetAsync(baseAddress + "api/Values/TestGet1").Result;
                response.Headers.Remove("Server");
                Console.WriteLine(response);
                Console.WriteLine(response.Content.ReadAsStringAsync
                    ().Result);
                Console.ReadLine();
            }

but how to stop the service when stop function will fire in windows service ?

i am looking for complete small code.