public void SaveTo(string filename)
{
    ConfigFile configFile = new ConfigFile();

    ConfigSection startupSection = configFile["Startup"];

    startupSection.SetValue("Create Clock", Startup.CreateClock);
    startupSection.SetValue("First Clock Name", Startup.FirstClockName);

    ConfigSection timeFormatSection = configFile["Time Format"];

    timeFormatSection.SetValue("Show Hours", TimeDisplaySettings.ShowHours);
    timeFormatSection.SetValue("Show Minutes", TimeDisplaySettings.ShowMinutes);
    timeFormatSection.SetValue("Show Seconds", TimeDisplaySettings.ShowSeconds);
    timeFormatSection.SetValue("Show Milliseconds", TimeDisplaySettings.ShowMilliseconds);
    timeFormatSection.SetValue("Show Plus Symbol", TimeDisplaySettings.ShowPlusSymbol);
    timeFormatSection.SetValue("Show Minus Symbol", TimeDisplaySettings.ShowMinusSymbol);
    timeFormatSection.SetValue("Show Leading Zero", TimeDisplaySettings.ShowLeadingZero);
    timeFormatSection.SetValue("Show Separators", TimeDisplaySettings.ShowSeparators);

    configFile.Save(filename);
}

public static Preferences Load(string filename)
{
    Preferences result = new Preferences();

    ConfigFile configFile = new ConfigFile();

    configFile.Load( filename );

    ConfigSection startupSection = configFile["Startup"];

    result.Startup.CreateClock = startupSection.GetBoolean("Create Clock", true);
    result.Startup.FirstClockName = startupSection.GetString("First Clock Name", "Sundial");

    result.TimeDisplaySettings = new TimeFormatSettings(TimeFormatFlags.Nothing);

    ConfigSection timeFormatSection = configFile["Time Format"];

    result.TimeDisplaySettings.ShowHours = timeFormatSection.GetBoolean("Show Hours", true);
    result.TimeDisplaySettings.ShowMinutes = timeFormatSection.GetBoolean("Show Minutes", true);
    result.TimeDisplaySettings.ShowSeconds = timeFormatSection.GetBoolean("Show Seconds", true);
    result.TimeDisplaySettings.ShowMilliseconds = timeFormatSection.GetBoolean("Show Milliseconds", true);
    result.TimeDisplaySettings.ShowPlusSymbol = timeFormatSection.GetBoolean("Show Plus Symbol", false);
    result.TimeDisplaySettings.ShowMinusSymbol = timeFormatSection.GetBoolean("Show Minus Symbol", true);
    result.TimeDisplaySettings.ShowLeadingZero = timeFormatSection.GetBoolean("Show Leading Zero", true);
    result.TimeDisplaySettings.ShowSeparators = timeFormatSection.GetBoolean("Show Separators", true);

    return result;
}