private void guna2DateTimePicker1_ValueChanged(object sender, EventArgs e)
{
day = guna2DateTimePicker1.Value.Day;
month = guna2DateTimePicker1.Value.Month;
year = guna2DateTimePicker1.Value.Year;
listThongKe = _thongkeBLL.FillDate(day, month, year);
listBinding.DataSource = listThongKe;
lbDay.Text = day.ToString();
lbMonth.Text = month.ToString();
lbYear.Text = year.ToString();
}