void _DataAccess_OnMessage(object sender, GTalkMessageEventArgs e)
 {
     _ReceiveMessage(e.User ?? _Credentials.UserName, e.Message, e.MessageReceivedTimeStamp.ToUniversalTime());
 }
 void _DataAccess_OnMessage(object sender, GTalkMessageEventArgs e)
 {
     _ReceiveMessage(e.User ?? _Credentials.UserName, e.Message);
 }