private void buttonLeft_Click(object sender, System.EventArgs e)
{
selectedDayLabel.BackColor = Color.Transparent;
selectedDayLabel.ForeColor = foreColor;
DateTime dt = selectedDayLabel.Date;
if (dt.Day > lastMonthDate.Day)
{
SelectedDate = lastMonthDate;
}
else
{
SelectedDate = SelectedDate.Subtract(new TimeSpan(lastMonthDate.Day, 0, 0, 0));
}
}