Index (zero based) must be greater than or equal to zero and less than the size of the argument list
<p>When trying to call my ToString() method I get the above error message.  I'm not sure what the problem is.  Here is my code:</p>

<pre><code> public override string  ToString()
    {
        return string.Format("{0} Pizzas @ {1:C}: {2:C}\n" +
            "{3} Cokes @ {4:C}  {5:C}\n" +
            "Order Amount: {6:C}\n" +
            "Sales Tax: {7:C}\n" +
            "Amount Due: {8:C}\n" +
            "Amount Paid: {9:C}\n" +
            "Change Due: {10:C}", numberOfPizzas, PIZZA_PRICE + 
            totalCostOfPizza, numberOfCokes, COKE_PRICE, totalCostOfCoke +
            foodAndDrinkTotal, totalSalesTax, totalAmountDue, amountPaid, +
            changeDue);
    }        
</code></pre>
