private void loadLabel()
{
lblTotal.Text = Revenue.GetTotalPrice() + " VND";
lblNextMonth.Text = Revenue.GetTotalPriceMonth() + " VND";
if (!Revenue.GetTotalPricePrevMonth().Equals(""))
{
lblPrevMonth.Text = Revenue.GetTotalPricePrevMonth() + " VND";
double prevMonth = Convert.ToDouble(Revenue.GetTotalPricePrevMonth());
double nowMonth = Convert.ToDouble(Revenue.GetTotalPriceMonth());
double percent = Math.Round((nowMonth * 100) / prevMonth - 100);
if (percent < 0)
{
lblUp.Text = "Giảm";
percent *= -1;
}
lblPercent.Text = percent.ToString() + " %";
}
else
{
lblPrevMonth.Text = "Chưa có";
}
}