private void btn_Cancelar_Click(object sender, EventArgs e)
 {
     if ((MessageBox.Show("Desea salir sin generar nuevo Ticket", "Volver al Menu Principal", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes))
     {
         frm_0MenuPrincipal ventanaMenuPrincipal = new frm_0MenuPrincipal();
         ventanaMenuPrincipal.ShowDialog();
     }
     else
     {
         return;
     }
 }
 private void button1_Click(object sender, EventArgs e)
 {
     frm_0MenuPrincipal ventana = new frm_0MenuPrincipal();
     ventana.ShowDialog();
 }