How to authenticate user in Ldap / OpenLdap using C# (user: test in domain ghashd.servebeer.com, server on ip 192.168.0.12 port 389)

LdapConnect.cs

using System;
using System.Net;
using System.DirectoryServices;
using System.DirectoryServices.Protocols;
using System.Security.Permissions;

namespace LdapConnection
{
    [DirectoryServicesPermission(SecurityAction.LinkDemand, Unrestricted = true)]
    public class LdapConnect
    {

        public static void Main(string[] args)
        {
            try
            {
                // Create the new LDAP connection
                LdapDirectoryIdentifier ldi = new LdapDirectoryIdentifier("192.168.0.12", 389);
                System.DirectoryServices.Protocols.LdapConnection ldapConnection =
                    new System.DirectoryServices.Protocols.LdapConnection(ldi);
                Console.WriteLine("LdapConnection is created successfully.");
                ldapConnection.AuthType = AuthType.Basic;
                ldapConnection.SessionOptions.ProtocolVersion = 3;
                NetworkCredential nc = new NetworkCredential("uid=testa,ou=people,dc=ghashd,dc=servebeer,dc=com",
                    "zaq12wsx"); //password
                ldapConnection.Bind(nc);
                Console.WriteLine("LdapConnection authentication success");
                ldapConnection.Dispose();
            }
            catch (LdapException e)
            {
                Console.WriteLine("\r\nUnable to login:\r\n\t" + e.Message);
            }
            catch (Exception e)
            {
                Console.WriteLine("\r\nUnexpected exception occured:\r\n\t" + e.GetType() + ":" + e.Message);
            }
        }
    }
}

works perfectly ... i wasnt able to connect with other methods thanks

works well but i have one one doubt..you are using 192.168.0.12 server...is this is a free online ldap server?? how can i get other user details in this?? since i am very new to this concept ..it makes me difficult to understand..
i had used online ldap.forumsys.com ...but it doesnt work..
please help me..
Thanks in advance..

No that is on LAN, 192.168.. is used for private networks.

What should be replaced ("192.168.0.12", 389) for these

how can i create new user with LDAP

For those who asking how to create an LDAP server, there are multiple options here:

1. use OpenLDAP an open-source server implementation of the LDAP protocol, you can download a running docker image from https://github.com/osixia/docker-openldap
2. use Apache Directory Studio includes Apache DS also another implementation in Java (this is the easiest option) https://directory.apache.org/studio/