Gets a list of all available domain controllers or find a single available controller.

ActiveDomainControllers.cs

using System;
using System.DirectoryServices.ActiveDirectory;
 
namespace ActiveDomainControllers
{
    public class Program
    {
        public static void Main(string[] args)
        {
            // Get a list of all available domain contollers
            var domainControllers = DomainController.FindAll(new DirectoryContext(DirectoryContextType.Domain, "domain.name"));
 
            foreach (DomainController domainController in domainControllers)
            {
                Console.WriteLine(domainController.Name);
            }
 
            // Finds a single domain controller that is currently available
            var singleDomainController = DomainController.FindOne(new DirectoryContext(DirectoryContextType.Domain, "domain.name"), LocatorOptions.ForceRediscovery);
 
            Console.WriteLine("Single: " + singleDomainController.Name);
        }
    }
}