private void radMenuIS_Click(object sender, EventArgs e) { if (IS == null) { IS = new frmImportSellout(); IS.MdiParent = this; IS.FormClosed += delegate { IS = null; }; IS.Show(); } else { MessageBox.Show("Ya esta Abierta la Ventana!!!"); } }
private void radMenuIS_Click(object sender, EventArgs e) { if(IS==null){ IS = new frmImportSellout(); IS.MdiParent = this; IS.FormClosed += delegate { IS = null; }; IS.Show(); } else { MessageBox.Show("Ya esta Abierta la Ventana!!!"); } }