public class CalendarHelper
{
	public const string OwnedCalendarsUrl = "http://www.google.com/calendar/feeds/default/owncalendars/full";

	private readonly CalendarService svc;

	public CalendarHelper(string username, string password)
	{
		this.svc = new CalendarService("demo");
		this.svc.setUserCredentials(username, password);
	}

	public IEnumerable<calendarEntry> FindOwnedCalendars()
	{
		CalendarQuery query = new CalendarQuery(OwnedCalendarsUrl);
		CalendarFeed result = this.svc.Query(query);
		foreach (CalendarEntry entry in result.Entries) yield return entry;
	}

	public CalendarEntry GetCalendar(string name)
	{
		return (
			from calendar in this.FindOwnedCalendars()
			where calendar.Title.Text == name
			select calendar).SingleOrDefault();
	}

	public IEnumerable<atomEntry> FindEvents(CalendarEntry calendar, DateTime begin, DateTime end)
	{
		EventQuery myQuery = new EventQuery(calendar.Content.AbsoluteUri);
		myQuery.StartTime = begin;
		myQuery.EndTime = end;
		EventFeed result = this.svc.Query(myQuery);
		for (int i = 0; i < result.Entries.Count; ++i) yield return result.Entries[i]; 
	} 
} 

private static void Main() 
{ 
	CalendarHelper helper = new CalendarHelper("user@gmail.com", "xxx"); 
	DateTime begin = new DateTime(2008, 1, 1); 
	DateTime end= new DateTime(2009, 12, 31); 
	IEnumerable<calendarEntry> calendars = helper.FindOwnedCalendars();
	
	foreach (CalendarEntry calendar in calendars)
	{
		Console.WriteLine(calendar.Title.Text);

		IEnumerable<atomEntry> calendarEvents = helper.FindEvents(calendar, begin, end);
		foreach(AtomEntry calendarEvent in calendarEvents)
		{
			Console.WriteLine("{0}: {1}", calendarEvent.Updated, calendarEvent.Title.Text);
		}

		Console.WriteLine();
	}

	Console.Write("{0}Press any key to continue...", Environment.NewLine);
	Console.ReadKey();
}