boost example : asynchronour server error

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C++

Boost

Hi ,
i am learing boost for a couple of days and when i tired their "Daytime.3 - An asynchronous TCP daytime server" example from the link

http://think-async.com/Asio/boost_asio_1_3_1/doc/html/boost_asio/tutorial/tutdaytime3/src.html[^]

it shows the following erro while building :" error C2039: 'io_service' : is not a member of 'boost::asio::basic_socket_acceptor<protocol">

the error is on the code part:

void start_accept()
 {
   tcp_connection::pointer new_connection =
     tcp_connection::create(acceptor_.io_service());

   acceptor_.async_accept(new_connection->socket(),
       boost::bind(&tcp_server::handle_accept, this, new_connection,
         boost::asio::placeholders::error));
 }

this is located inside the server class.can any one help me resolving this .

i am u sing visual c++ 2008 and boost 1.47.0 .

thanks in advance,
hari