private void btnDuplexTest_Click(object sender, EventArgs e) { if (speedTestForm == null) { speedTestForm = new SpeedTestForm(); speedTestForm.Show(this.ParentForm); speedTestForm.FormClosed += SpeedTestForm_FormClosed; } else { speedTestForm.BringToFront(); } }
private static void SpeedTestForm_FormClosed(object sender, FormClosedEventArgs e) { speedTestForm = null; }