private void btnSecLock_Click(object sender, EventArgs e)
        {
            byte membank;
            byte pwdLevel;

            int status = 0;

            byte[] value = new byte[16];

            string s = "";

            if (tEpcAccess.TextLength != 8)
            {
                lInfo.Items.Add("Access Password length not enough");
                return;
            }
            uint unAccPwd;

            switch (cEpcMembank.SelectedIndex)
            {
            case 0:
                membank = 3;
                break;

            case 1:
                membank = 2;
                break;

            case 2:
                membank = 1;
                break;

            case 3:
                membank = 0;
                break;

            default:
                membank = 2;
                break;
            }
            pwdLevel = (byte)(cmbLevel.SelectedIndex);

            unAccPwd = Convert.ToUInt32(tEpcAccess.Text, 16);
            status   = Api.Gen2SecLock(unAccPwd, membank, pwdLevel);
            if (status != 0)
            {
                lInfo.Items.Add("Lock EPC tag failed!");
                return;
            }
            else
            {
                lInfo.Items.Add("Lock EPC tag success!");
                lInfo.Items.Add(s);
            }
        }