agsXMPP.XmppClientConnection objXmpp;

objXmpp = new agsXMPP.XmppClientConnection();
agsXMPP.Jid jid = null;
jid = new agsXMPP.Jid("Email Address");

objXmpp.Port = 5222;
objXmpp.Password = "Password";
objXmpp.Username = jid.User;
objXmpp.ConnectServer = "talk.google.com";
objXmpp.Server = jid.Server;
objXmpp.UseStartTLS = true;

objXmpp.AutoResolveConnectServer = true;
objXmpp.Open();
xmpp.OnLogin += delegate(object o)
{
    xmpp.Send(new Message("Sending Email Address",
                          MessageType.chat,
                          "Hello, how are you?"));
};

private void OnMessageHandler(object sender, Message msg)
{
    //Do something here
}

objXmpp.OnMessage += new MessageHandler(OnMessageHandler);