internal void Enviarme(ListBox listBox, altaHotel altaHotel, buscadorRegimenes b)
 {
     foreach (var item in listBox.Items)
     {
         listBoxRegimenesElegidos.Items.Add(item);
     }
     list     = listBox;
     ventana  = altaHotel;
     buscador = b;
 }
        private void button3_Click(object sender, EventArgs e)
        {
            altaHotel alta = new altaHotel();

            alta.ShowDialog();
        }