private void quit_Click(object sender, EventArgs e) { int ret = 0; try { // shutdown eyetracking-server ret = ETDevice.iV_Quit(); if (ret == 1) { logger.Text = "iV_Quit: server shut down"; } if (ret != 1) { logger.Text = "iV_Quit: failed to shut down server: " + ret; } } catch (Exception exc) { logger1.Text = "Exception during iV_Quit: " + exc.Message; } }