private void btnCloseSerialModule3_Click(object sender, EventArgs e) { mf.CloseModule3Port(); if (mf.spModule3.IsOpen) { cboxModule3Port.Enabled = false; btnCloseSerialModule3.Enabled = true; btnOpenSerialModule3.Enabled = false; } else { cboxModule3Port.Enabled = true; btnCloseSerialModule3.Enabled = false; btnOpenSerialModule3.Enabled = true; } }