DotNetCore Ldap query (Novell.Directory.Ldap.NetStandard2_0)

using System;
using Novell.Directory.Ldap;

namespace KerberosAuth
{
    class Program
    {
        static void Main(string[] args)
        {
            using (var cn = new LdapConnection())
            {
                // connect
                cn.Connect("ldap.forumsys.com", 389);
                // bind with an username and password
                // this how you can verify the password of an user
                cn.Bind("cn=read-only-admin,dc=example,dc=com", "password");
                int searchScope = LdapConnection.SCOPE_ONE;
                // call ldap op
                // cn.Delete("<<userdn>>")
                // cn.Add(<<ldapEntryInstance>>)
                LdapSearchResults searchResults =
                    cn.Search("dc=example,dc=com",      // container to search
                        searchScope,     // search scope
                        "(objectclass=*)",    // search filter
                new []{LdapConnection.NO_ATTRS},           // "1.1" returns entry name only
                        true);  // no attributes are returned
                
                while ( searchResults.HasMore() ) 
                {
                    LdapEntry nextEntry = null;
                    try 
                    {
                        nextEntry = searchResults.Next();
                    }
                    catch(LdapException e) 
                    {
                        Console.WriteLine("Error: " + e.ToString());

                        // Exception is thrown, go for next entry
                        continue;
                    }

                    Console.WriteLine("\n" + nextEntry.DN);
                }
            }
        }
    }
}