private void LoadThongTinHoaDon() { if (BLL.showNgayXuatTheoHoaDon(txtMaHD.Text) == "") { dtpNgayXuat.Value = DateTime.Parse(DateTime.Now.ToString("yyyy-MM-dd")); } dtpNgayXuat.Value = DateTime.Parse(BLL.showNgayXuatTheoHoaDon(txtMaHD.Text)); cbxMaNV.Text = BLL.showMaNVTheoHoaDon(txtMaHD.Text); txtTongTien.Text = BLL.showTongTienTheoHoaDon(txtMaHD.Text); lblBangChu.Text = "Bằng chữ " + ChuyenSoSangChuoi(double.Parse(txtTongTien.Text)); }