How do I connect imap.gmail.com

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C#3.5

SSL

IMAP

When I want to connect the imap.gmail.com with ssl, It did not work in sslStream.AuthenticateAsClient("imap.gmail.com") , The program stop here.

Here is my code:

var m_oImapServ = new TcpClient("imap.gmail.com", "995");

var sslStrm = new SslStream(m_oImapServ.GetStream(),false);                    

    sslStrm.ReadTimeout = 30000;
    try
        {
            ((SslStream)sslStrm).AuthenticateAsClient("imap.gmail.com");

         }
     catch (AuthenticationException e)
          {
             Console.WriteLine("Exception: {0}", e.Message);
             if (e.InnerException != null)
                 {
                    Console.WriteLine("Inner exception: {0}", e.InnerException.Message);
                  }
                   Console.WriteLine("Authentication failed - closing the connection.");
                   m_oImapServ.Close();
                   return ImapResponseEnum.IMAP_FAILURE_RESPONSE;
                  }  

      m_oNetStrm = (Stream) sslStrm;
     m_oRdStrm = new StreamReader(sslStrm);

As client side need a cetification? Can anybody help me? thanks a lot.