private void button1_Click(object sender, EventArgs e)
{
//comprueba si ya esta abierto el formulario de entidades
Form existe = Application.OpenForms.OfType <Form>().Where(pre => pre.Name == "MDIEntidades").SingleOrDefault <Form>();
if (existe == null)
{
if (ActiveMdiChild != null)
{
ActiveMdiChild.Close();
}
this.LayoutMdi(MdiLayout.TileHorizontal);
Form f = new MDIEntidad();
f.MdiParent = this;
f.Show();
f.WindowState = FormWindowState.Minimized;
f.WindowState = FormWindowState.Maximized;
}
}
