private void GetDirectoryServiceUsers()
        {
            try
            {
                using (var root = new DirectoryEntry("LDAP://192.168.0.1:389/OU=DBR,OU=workers,DC=company,DC=local"))
                {
                    using (var ds = new DirectorySearcher(root))
                    {
                        ds.PropertiesToLoad.AddRange(new[]
                        {
                            "objectguid",
                            "samaccountname",
                            "name",
                        });
 
                        ds.Filter = "(sAMAccountType=805306368)";
                        ds.SearchScope = SearchScope.OneLevel;
 
                        using (var results = ds.FindAll())
                        {
                            foreach (SearchResult result in results) // CRASH !!!!!!!!!!!!
                            {
                                if (result?.Properties.PropertyNames == null)
                                    continue;
 
                                Console.WriteLine();
                            }
                        }
                    }
                }
            }
            catch (Exception e)
            {
                Console.WriteLine(e);
            }
 
        }