How to get the list of Active Directory in the System windows c# .net

How to get the list of Active Directory in the System windows c# .net

public partial class Form3 : Form

    {

        public Form3()

        {

            InitializeComponent();

            Domain domain = null;

            DomainController domainController = null;

            try

            {

                domain = Domain.GetCurrentDomain();

                DomainName = domain.Name;

                domainController = domain.PdcRoleOwner;

                DomainControllerName = domainController.Name.Split('.')[0];

                ComputerName = Environment.MachineName;

            }

            finally

            {

                if (domain != null)

                    domain.Dispose();

                if (domainController != null)

                    domainController.Dispose();

            }

        }

        public static string DomainControllerName { get; private set; }

        public static string ComputerName { get; private set; }

        public static string DomainName { get; private set; }

        public static string DomainPath

        {

            get

            {

                bool bFirst = true;

                StringBuilder sbReturn = new StringBuilder(200);

                string[] strlstDc = DomainName.Split('.');

                foreach (string strDc in strlstDc)

                {

                    if (bFirst)

                    {

                        sbReturn.Append("DC=");

                        bFirst = false;

                    }

                    else

                        sbReturn.Append(",DC=");

                    sbReturn.Append(strDc);

                }

                return sbReturn.ToString();

            }

        }

        public static string RootPath

        {

            get

            {

                return string.Format("LDAP://{0}/{1}", DomainName, DomainPath);

            }

        }

    }