public void LogMessageToFile(string msg)
    {
        System.IO.StreamWriter sw = System.IO.File.AppendText("log.txt");
        try
        {
            string logLine = System.String.Format(
                "{0:G}: {1}.", System.DateTime.Now, msg);
            sw.WriteLine(logLine);
        }
        finally
        {
            sw.Close();
        }
    }