//Menu toolStrip //Sampling time setting private void intervalSampToolStripMenuItem_Click(object sender, EventArgs e) { string strRet; using (SamplingForm formSetting = new SamplingForm()) { formSetting.ShowDialog(); strRet = formSetting.MyString; if (strRet != "NAN") { samplingTime = int.Parse(strRet); } update_status("Set sampling time is: " + samplingTime.ToString(), true); upDateTimer(); } }