using System;
using System.Management;

namespace DomainJoin
{
    class Program
    {
        static void Main(string[] args)
        {
            string domain = "example.com";
            string password = "secret";
            string username = "EXAMPLE\\administrator";
            string OU = "OU=Computers,DC=example,DC=com";

            ManagementObject managementObject = new ManagementObject("Win32_ComputerSystem.Name=\"" + Environment.MachineName + "\"");
            managementObject.Scope.Options.Authentication = AuthenticationLevel.PacketPrivacy;
            managementObject.Scope.Options.Impersonation = ImpersonationLevel.Impersonate;
            managementObject.Scope.Options.EnablePrivileges = true;

            int mode = 1 | 2;

            string[] parameters = new string[5]
            {
                domain,
                password,
                username,
                OU,
                mode
            };

            int returnCode = Convert.ToInt32(managementObject.InvokeMethod("JoinDomainOrWorkgroup", parameters));

            Console.WriteLine("Domain join has completed with code " + returnCode);
        }
    }
}