Create a Google calendar event in an existing calendar

var credentials = new GDataCredentials(userName, password);
var service = new CalendarService(null) {Credentials = credentials};
var query = new CalendarQuery("https://www.google.com/calendar/feeds/default/owncalendars/full");
var feed = service.Query(query);
var eventFeedLink = feed.Entries.Cast<CalendarEntry>()
    .Where(item => item.Title.Text == calendarName)
    .SelectMany(item => item.Links)
    .First(link => link.Rel == GDataParserNameTable.NSGCal + "#eventFeed");
var entry = new EventEntry(title) {Times = {new When(start, end, allDay)}};
service.Insert(new Uri(eventFeedLink.AbsoluteUri), entry);

Google Data API .NET client library