private void btnStartLogging_Click(object sender, EventArgs e) { if (btnStartLogging.Text == "Start Logging") { TsMasterApi.tsapp_start_logging(@".\TestData" + DateTime.Now.ToString("dd-HH-mm-ss") /*+ ".blf"*/); btnStartLogging.Text = "Stop Logging"; } else { TsMasterApi.tsapp_stop_logging(); btnStartLogging.Text = "Start Logging"; } }