public void byMonth()
        {
            lsvGeneralReport.Items.Clear();
            ReceiptDao r       = new ReceiptDao();
            PaymentDao p       = new PaymentDao();
            var        incomes = r.GetReceiptList();

            for (int i = 1; i <= 12; i++)
            {
                if (i >= 10)
                {
                    string[]     rows = { "Tháng " + i, "" + r.GetByMonth(i.ToString()), "" + p.GetByMonth(i.ToString()), (r.GetByMonth(i.ToString()) - p.GetByMonth(i.ToString())).ToString() };
                    ListViewItem item = new ListViewItem(rows);
                    lsvGeneralReport.Items.Add(item);
                }
                else
                {
                    string[] rowss = { "Tháng " + i, "" + r.GetByMonth("0" + i.ToString()), "" + p.GetByMonth("0" + i.ToString()), (r.GetByMonth("0" + i.ToString()) - p.GetByMonth("0" + i.ToString())).ToString() };
                    var      item  = new ListViewItem(rowss);
                    lsvGeneralReport.Items.Add(item);
                }
            }
        }