private async void GetCalendarFeed()
        {
            var ret = await ICalParser.GetCalenderEvents("https://calendar.google.com/calendar/ical/hbbe92b9tvlr9rosslm092chn4%40group.calendar.google.com/public/basic.ics");

            var first = ret.FirstOrDefault(d => d.StartDate >= DateTime.Now && d.StartDate.Date == DateTime.Today);

            if (first != null)
            {
                tbSecMessage.Text  = first.StartDateText;
                tbMainMessage.Text = first.Title;
            }
        }
        private async void GetFeed()
        {
            //var calUrl = "https://calendar.google.com/calendar/ical/hbbe92b9tvlr9rosslm092chn4%40group.calendar.google.com/public/basic.ics";
            //var calStream = await httpClient.GetStreamAsync(calUrl);
            //var ret = new List<CalendarEvent>();
            //var currentEvent = new CalendarEvent();
            //CultureInfo us = new CultureInfo("en-US");
            //var hasStarted = false;
            //using (var sr = new StreamReader(calStream))
            //{
            //    while (sr.Peek() >= 0)
            //    {
            //        var line = sr.ReadLine();
            //        if (line == "BEGIN:VEVENT")
            //            hasStarted = true;
            //        var parts = line.Split(':');
            //        var key = parts[0];
            //        var value = parts[1];
            //        if (hasStarted)
            //        {
            //            if (key == "DTSTART")
            //            {
            //                currentEvent.StartDate = DateTime.ParseExact(value, "yyyyMMddTHHmmssZ", us);
            //            }
            //            else if (key == "DTEND")
            //            {
            //                currentEvent.EndDate = DateTime.ParseExact(value, "yyyyMMddTHHmmssZ", us);
            //            }
            //            else if (key == "SUMMARY")
            //            {
            //                currentEvent.Title = value;
            //            }
            //            else if (line == "END:VEVENT")
            //            {
            //                ret.Add(currentEvent);
            //                currentEvent = new CalendarEvent();
            //            }
            //        }
            //    }
            //}
            var ret = await ICalParser.GetCalenderEvents("https://calendar.google.com/calendar/ical/hbbe92b9tvlr9rosslm092chn4%40group.calendar.google.com/public/basic.ics");

            listView.ItemsSource = ret.Where(d => d.EndDate >= DateTime.Now).OrderBy(d => d.StartDate).Take(4);
        }