Recommended login flow for .Net desktop/console applications

using System;
using KiteConnect;
using System.Net;
using System.Net.Sockets;
using System.Threading.Tasks;
using System.Diagnostics;

namespace KiteConnectLoginExample
{
    class Program
    {
        static void Main(string[] args)
        {
            login();
            Console.ReadKey();
        }

        public static async void login()
        {
            Kite kite = new Kite("api_key", Debug: true);

            // Generate a redirect url for local http server
            string redirectURL = string.Format("http://{0}:{1}/", IPAddress.Loopback, GetRandomUnusedPort());

            Console.WriteLine("Redirect URL: " + redirectURL);

            // Generate kite login url with the above redirect url
            string loginURL = string.Format("{0}&redirect_url={1}", kite.GetLoginURL(), redirectURL);

            Console.WriteLine("Login URL: " + loginURL);

            // Start local http server for catching the redirect url
            var http = new HttpListener();
            http.Prefixes.Add(redirectURL);
            http.Start();
            Console.WriteLine("Waiting for login to finish");

            // Launch default browser with login url
            Process.Start(new ProcessStartInfo(loginURL) { UseShellExecute = true });

            // Wait until login is complete and redirect url is launched
            var context = await http.GetContextAsync();

            // Send a response back to browser
            var response = context.Response;
            string responseString = string.Format("Please return to the app");
            var buffer = System.Text.Encoding.UTF8.GetBytes(responseString);
            response.ContentLength64 = buffer.Length;
            var responseOutput = response.OutputStream;
            Task responseTask = responseOutput.WriteAsync(buffer, 0, buffer.Length).ContinueWith((task) =>
            {
                responseOutput.Close();
                http.Stop();
                Console.WriteLine("HTTP server stopped.");
            });

            // Collect request token from the redirect url
            var requestToken = context.Request.QueryString.Get("request_token");
            if (requestToken == null)
            {
                Console.WriteLine("Login was not completed");
                return;
            }

            // Use request token to generate access token
            User user = kite.GenerateSession(requestToken, "app_secret");

            // Store this locally and reuse it. This is valid for one day
            Console.WriteLine("Access token: " + user.AccessToken);

            kite.SetAccessToken(user.AccessToken);
            kite.GetHoldings();
        }

        // Helper function to get a random local port to start an http server
        public static int GetRandomUnusedPort()
        {
            var listener = new TcpListener(IPAddress.Loopback, 0);
            listener.Start();
            var port = ((IPEndPoint)listener.LocalEndpoint).Port;
            listener.Stop();
            return port;
        }
    }
}