private void unoToolStripMenuItem2_Click(object sender, EventArgs e) { Form frmC = Application.OpenForms.Cast <Form>().FirstOrDefault(x => x is ConsultMaestro); if (Consult_Uno == false || frmC == null) { if (frmC == null) { consult_uno = new ConsultMaestro(); } consult_uno.MdiParent = this; consult_uno.Show(); Application.DoEvents(); Consult_Uno = true; } else { consult_uno.WindowState = System.Windows.Forms.FormWindowState.Normal; } }