private void pcbvolver_Click(object sender, EventArgs e)
        {
            Frm_Principal frm = new Frm_Principal();

            frm.Show();
            this.Hide();
        }
        private void pcbreconocimiento_Click(object sender, EventArgs e)
        {
            Frm_Principal frm = new Frm_Principal();

            frm.Show();
        }