private void libroToolStripMenuItem1_Click(object sender, EventArgs e)
 {
     EliminarLibro vnt = new EliminarLibro();
     vnt.Show();
 }
        private void libroToolStripMenuItem1_Click(object sender, EventArgs e)
        {
            EliminarLibro vnt = new EliminarLibro();

            vnt.Show();
        }