Authenticate domain user using LDAP, providing IP of Dc

Original post: https://gist.github.com/dzitkowskik/279164c1343e652660dc

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);
            }
        }
    }
}