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);
            }
        }
    }
}

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/