private void cmdSetCompany_Click(object sender, EventArgs e)
        {
            int     vEMachineNumber;
            Boolean vRet;
            int     vErrorCode = 0;
            string  vName      = "";


            lblMessage.Text = "Working...";
            Application.DoEvents();

            vRet = bpc.EnableDevice(Program.gMachineNumber, 0); // 0 : false
            if (!vRet)
            {
                lblMessage.Text = util.gstrNoDevice;
                return;
            }

            vEMachineNumber = Convert.ToInt32(cmbEMachineNumber.Text);

            vName = txtName.Text;
            vRet  = bpc.SetCompanyName1(Program.gMachineNumber, 1, ref vName);
            if (vRet)
            {
                lblMessage.Text = "Set Company Name OK";
            }
            else
            {
                bpc.GetLastError(ref vErrorCode);
                lblMessage.Text = util.ErrorPrint(vErrorCode);
            }

            bpc.EnableDevice(Program.gMachineNumber, 1); // 1 : true
        }