private void Ping()
{
StringBuilder sb = new StringBuilder ();
sb.Append ("<iq type='get'");
sb.Append (" to='livecoding.tv'");
sb.Append (" xmlns='jabber:client'");
sb.Append (" id='");
sb.Append (IDManager.SendIqId().ToString());
sb.Append (":sendIQ'>");
sb.Append ("<ping xmlns='urn:xmpp:ping'/>");
sb.Append("</iq>");
Send (sb.ToString ());
}