void uati_FormClosed(object sender, FormClosedEventArgs e) { uati = null; }
private void updateATrainingInformationToolStripMenuItem_Click(object sender, EventArgs e) { if (uati == null) { uati = new UpdateATrainingInformation(n); uati.MdiParent = this; uati.FormClosed +=uati_FormClosed; uati.Show(); } else { uati.Activate(); } }