private void frmHoaDon_Load(object sender, EventArgs e) { dgvChiTietHD.DataSource = dbHoaDon.LayChiTietHD(frmMain.maHD); lbNgayLap.Text = DateTime.Today.ToShortDateString(); lbMaNVTN.Text = frmMain.maNVTN; lbSoHD.Text = frmMain.maHD; lbPhuThu.Text = dbHoaDon.LayTienPhuThu(frmMain.maHD); lbTongTien.Text = dbHoaDon.LayTongTien(frmMain.maHD); }