How to programmatically determine if a user is authorized in an IIS Website

A customer had a unique need of verifying authorized users against a website that runs on IIS. The code is short and simple if you know what component and method(s) to invoke.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Microsoft.Web.Management.Server;

namespace ConsoleApp1
{
class Program
{
static void Main(string[] args)
{
string message = null;
string isUserFound = "No";
string sprovider = null;
string userName = "john.doe";

ManagementAuthorizationInfoCollection authorizedCollection = ManagementAuthorization.GetAuthorizedUsers("Default Web Site", true, 0, 10);

sprovider = "Provider: " + ManagementAuthorization.Provider;
Console.WriteLine("{0}", sprovider);

// Search the returned collection.
foreach (ManagementAuthorizationInfo authorizedInfo in authorizedCollection)
{
// Check to see if the user is already in the allowed users collection.
if (userName.Equals(authorizedInfo.Name))
{
isUserFound = "yes";
}
}

Console.WriteLine("Does John.doe exist? {0}",isUserFound);

Console.WriteLine("done calling Microsoft.Web.Management.dll. Hit any key");
Console.ReadLine();

}
}
}