How to display all the web applications where a custom MembershipProvider is installed

The following piece code is a little console application which displays all the web applications where a custom MembershipProvider passed as argument is installed:

using System;

using System.Collections.Generic;

using System.Text;

using Microsoft.SharePoint.Administration;

using System.Web.Configuration;

namespace DisplayWebAppsUsingACustomProvider

{

    class Program

    {

        static void Main(string[] args)

        {

            try

            {

                if (args == null  args.Length != 1)

                {

                    throw new ArgumentException("Invalid argument.");

                }

                string myMembershipProvider = args[0];

                SPFarm farm = SPFarm.Local;

                Console.WriteLine(string.Format("Connected to farm: {0}.", farm.DisplayName));

                SPWebService service = farm.Services.GetValue<SPWebService>("");

                Console.WriteLine("Services has been retrieved.");

                foreach (SPWebApplication webApp in service.WebApplications)

                {

                    Console.WriteLine(string.Format("Connected to Web Application: {0}.", webApp.DisplayName));

                    if (!webApp.IsAdministrationWebApplication)

                    {

                        foreach (SPUrlZone zone in webApp.IisSettings.Keys)

                        {

                            SPIisSettings setting = webApp.IisSettings[zone];

                            if (setting.AuthenticationMode == AuthenticationMode.Forms)

                            {

                                if (setting.MembershipProvider.ToLower() == myMembershipProvider.ToLower())

                                {

                                    Console.WriteLine(string.Format("MembershipProvider \"{0}\" found.", myMembershipProvider));

                                }

                            }

                        }

                    }

                }

            }

            catch (Exception ex)

            {

                Console.WriteLine(string.Format("Message: {0} {1} Stack:{2}.", ex.Message, System.Environment.NewLine, ex.StackTrace));

            }

            Console.WriteLine("Press a touch to exit.");

            Console.ReadLine();

        }

    }

}