LdapConnection _connection = new LdapConnection(new LdapDirectoryIdentifier(m_DomainName, m_PortNo));
_connection.Timeout = TimeSpan.FromMinutes(10);
_connection.SessionOptions.ProtocolVersion = 3;
_connection.SessionOptions.SecureSocketLayer = true;

_connection.SessionOptions.VerifyServerCertificate = (ldapCon, serverCertificate) =>
{
   //TODO: Verify server certificate
   return true;
};
_connection.SessionOptions.QueryClientCertificate = (con, trustedCAs) => null;

_connection.AuthType = AuthType.Basic;
_connection.Credential = new NetworkCredential(m_UserName, m_Password);

_connection.Bind();