protected void Page_Load(object sender, EventArgs e)
{
var selectedDate = new DateTime(2015, 1, 1);
StartDateCalendarExtender.StartDate = new DateTime(2015, 1, 1);
StartDateCalendarExtender.SelectedDate = selectedDate;
EndDateCalendarExtender.EndDate = new DateTime(2015, 1, 1);
EndDateCalendarExtender.SelectedDate = selectedDate;
BothDatesCalendarExtender.StartDate = new DateTime(2015, 1, 1);
BothDatesCalendarExtender.EndDate = new DateTime(2015, 2, 2);
BothDatesCalendarExtender.SelectedDate = selectedDate;
RangeExceedsDecadeTextBoxCalendarExtender.StartDate = new DateTime(2000, 1, 1);
RangeExceedsDecadeTextBoxCalendarExtender.EndDate = new DateTime(2030, 1, 1);
RangeExceedsDecadeTextBoxCalendarExtender.SelectedDate = selectedDate;
SelectedDateCalendarExtender.SelectedDate = selectedDate;
}