private void dtpNgayBan_TextChanged(object sender, EventArgs e) { string ngayBan = dtpNgayBan.Text; DateTime time = UnixTime.GetTimeUnix(1538835973); //1539993600 1540079999 int fromTime = UnixTime.GetUnixTime(Convert.ToDateTime(ngayBan + " 00:00:00 AM")); int toTime = UnixTime.GetUnixTime(Convert.ToDateTime(ngayBan + " 23:59:59 PM")); data = BPhieuBanHang.GetSumDay(fromTime, toTime); dtgvHoaDon.DataSource = data; SoHoaDon = data.Rows.Count; for (int i = 0; i < SoHoaDon; i++) { TongDoanhThu = TongDoanhThu + int.Parse(data.Rows[i]["TongTien"].ToString()); } txtTongDoanhThu.Text = TongDoanhThu.ToString(); txtSoHoaDon.Text = SoHoaDon.ToString(); }