private void cursosToolStripMenuItem1_Click(object sender, EventArgs e) { Form frmC = Application.OpenForms.Cast <Form>().FirstOrDefault(x => x is ConsultCurso); if (Consult_7 == false || frmC == null) { if (frmC == null) { consult_7 = new ConsultCurso(); } consult_7.MdiParent = this; consult_7.Show(); Application.DoEvents(); Consult_7 = true; } else { consult_7.WindowState = System.Windows.Forms.FormWindowState.Normal; } }