Как проверить атрибут в Active Directory посредством c#?

SearchResultCollection adSearchResult;

            using (DirectoryEntry de = new DirectoryEntry("LDAP://esrr.oao.rzd"))
            {
                using (DirectorySearcher adSearch = new DirectorySearcher(de))
                {
                    adSearch.Filter = $"(&(objectCategory=person)(objectClass=user)(name={searchString}*)(objectCategory=person)(objectClass=user)(!userAccountControl:1.2.840.113556.1.4.803:=2))";
                    //adSearch.PropertiesToLoad.Add("displayName");
                    adSearchResult = adSearch.FindAll();

                }
            }

public void ResetPassword(string userDn, string password)
{
    DirectoryEntry uEntry = new DirectoryEntry(userDn);
    uEntry.Invoke("SetPassword", new object[] { password });
    uEntry.Properties["LockOutTime"].Value = 0; //unlock account

    uEntry.Close();
}