private void bRfQuery_Click(object sender, EventArgs e) { byte pwr = 0; byte freq = 0; int status; status = Api.GetRf(ref pwr, ref freq); if (status != 0) { lInfo.Items.Add("Get Rf settings failed!"); return; } tRfPwr.Value = pwr; cRfFreq.SelectedIndex = freq; lInfo.Items.Add("Get Rf settings success!"); }