/// <summary>
        /// Buy the Ticket and pay up
        /// Shows MessageBox with the selected tickets and calculates the change money
        /// </summary>
        private void PayUp()
        {
            var change = EnteredMoneyTotal - TotalPrice;

            if (change >= 0)
            {
                StringBuilder message = new StringBuilder();
                message.AppendLine("Folgende Fahrscheine gekauft: ");
                ShoppingCart.ToList().ForEach(ticket => message.AppendLine($"- {ticket.Amount}x {ticket.TicketName}"));
                message.AppendLine();

                message.AppendLine($"Wechselgeld: {change:0.00}€");
                message.AppendLine(GetStringFromMoneyList(CalculateChange()));

                MessageBox.Show(message.ToString(), "Nett mit dir Geschäfte zu machen :)", MessageBoxButton.OK, MessageBoxImage.Information);

                EnteredMoneyBits.Clear();
                ShoppingCart.ToList().ForEach(ticket => ticket.Amount = 0);
                ShoppingCart.Clear();
                RefillShoppingCart();
                RaisePropertyChanged(nameof(TotalPrice));
                RaisePropertyChanged(nameof(EnteredMoneyTotal));
            }
            else
            {
                MessageBox.Show("Nicht genügend Geld eingeworfen. :(", "NEED MOAR MONEY!!!", MessageBoxButton.OK, MessageBoxImage.Warning);
            }
        }
        /// <summary>
        /// Eject the entered money
        /// Show MessageBox with the money to be ejected
        /// </summary>
        private void EjectMoney()
        {
            StringBuilder message = new StringBuilder();

            message.AppendLine($"Eingezahltes Geld wird zurückgegeben: {EnteredMoneyTotal:0.00}€");
            message.AppendLine();
            message.AppendLine(GetStringFromMoneyList(EnteredMoneyBits));

            MessageBox.Show(message.ToString(), "Schade, dann halt nicht. :(", MessageBoxButton.OK, MessageBoxImage.Information);

            EnteredMoneyBits.Clear();
            RaisePropertyChanged(nameof(EnteredMoneyTotal));
        }