private void button1_Click(object sender, EventArgs e)
        {
            Form ventPrincipal = new interfazPrincipal();

            ventPrincipal.Show();
            ventPrincipal.Visible = true;
            this.Visible          = false;
        }
        private void butVolver_Click(object sender, EventArgs e)
        {
            Form ventInicio = new interfazPrincipal();

            ventInicio.Visible = true;
            ventInicio.Show();
            this.Visible = false;
        }
 public listadoLibros(interfazPrincipal a)
 {
     principal = a;
     InitializeComponent();
 }
 public interfazAdmin(interfazPrincipal principal)
 {
     conexionPrincipal = principal;
     InitializeComponent();
 }
 public interfazAgendar(interfazPrincipal principal)
 {
     conexionInterfazPrincipal = principal;
     InitializeComponent();
 }