Invoice Class

Namespace: Last.First.Business

This abstract class contains functionality that supports the business process of creating an invoice.

Create the Invoice class in the Library project. This class must be defined under the Last.First.Business namespace.

Design

Fields

- provincialSalesTaxRate : decimal - The provincial sales tax rate applied to the invoice.

- goodsAndServicesTaxRate : decimal - The goods and services tax rate applied to the invoice.

Properties

+ ProvincialSalesTaxRate : decimal - Gets and sets the provincial sales tax rate.

Exceptions:

ArgumentOutOfRangeException - Thrown when the property is set to less than 0. Message: The value cannot be less than 0. Parameter name: value.

ArgumentOutOfRangeException - Thrown when the property is set to greater than 1. Message: The value cannot be greater than 1. Parameter name: value.

+ GoodsAndServicesTaxRate : decimal - Gets and sets the goods and services tax rate.

Exceptions:

ArgumentOutOfRangeException - Thrown when the property is set to less than 0. Message: The value cannot be less than 0. Parameter name: value.

ArgumentOutOfRangeException - Thrown when the property is set to greater than 1. Message: The value cannot be greater than 1. Parameter name: value.

+ ProvincialSalesTaxCharged : decimal (Abstract) - Gets the amount of provincial sales tax charged to the customer (Rounded to two decimal places).

+ GoodsAndServicesTaxCharged : decimal (Abstract) - Gets the amount of goods and services tax charged to the customer (Rounded to two decimal places).

+ SubTotal : decimal (Abstract) - Gets the subtotal of the Invoice.

+ Total : decimal - Gets the total of the Invoice. The total is the sum of the subtotal and taxes.

Methods

+ Invoice(decimal, decimal) - Initializes an instance of Invoice with a provincial and goods and services tax rates.

Parameters:

provincialSalesTaxRate - The rate of provincial tax charged to a customer.

goodsAndServicesTaxRate - The rate of goods and services tax charged to a customer.

Exceptions:

ArgumentOutOfRangeException - Thrown when the provincial sales tax rate is less than 0. Message: The argument cannot be less than 0. Parameter name: provincialSalesTaxRate.

ArgumentOutOfRangeException - Thrown when the provincial sales tax rate is greater than 1. Message: The argument cannot be greater than 1. Parameter name: provincialSalesTaxRate.

ArgumentOutOfRangeException - Thrown when the goods and services tax rate is less than 0. Message: The argument cannot be less than 0. Parameter name: goodsAndServicesTaxRate.

ArgumentOutOfRangeException - Thrown when the goods and services tax rate is greater than 1. Message: The argument cannot be greater than 1. Parameter name: goodsAndServicesTaxRate.

CarWashInvoice Class

This class contains functionality that supports the business process of creating an invoice for the car wash department. The CarWashInvoice class derives from the Invoice class.

Create the CarWashInvoice class in the Library project. This class must be defined under the Last.First.Business namespace.

Design

Fields

- packageCost : decimal - The amount charged for the chosen package.

- fragranceCost : decimal - The amount charged for the chosen fragrance.

Properties

+ PackageCost : decimal - Gets and sets the amount charged for the chosen package.

Exception:

ArgumentOutOfRangeException - Thrown when the property is set to less than 0. Message: The value cannot be less than 0. Parameter name: value.

+ FragranceCost : decimal - Gets and sets the amount charged for the chosen fragrance.

Exception:

ArgumentOutOfRangeException - Thrown when the property is set to less than 0. Message: The value cannot be less than 0. Parameter name: value.

+ ProvincialSalesTaxCharged : decimal - Gets the amount of provincial sales tax charged to the customer. No provincial sales tax is charged for a car wash.

+ GoodsAndServicesTaxCharged : decimal - Gets the amount of goods and services tax charged to the customer (Rounded to 2 decimal places). The tax is calculated by multiplying the tax rate by the subtotal.

+ SubTotal : decimal - Gets the subtotal of the Invoice. The subtotal is the sum of the package and fragrance cost.

Methods

+ CarWashInvoice(decimal, decimal) - Initializes an instance of CarWashInvoice with a provincial and goods and services tax rates. The package cost and fragrance cost are zero.

Parameters:

provincialSalesTaxRate - The rate of provincial tax charged to a customer.

goodsAndServicesTaxRate - The rate of goods and services tax charged to a customer.

Exceptions:

ArgumentOutOfRangeException - Thrown when the provincial sales tax rate is less than 0. Message: The argument cannot be less than 0. Parameter name: provincialSalesTaxRate.

ArgumentOutOfRangeException - Thrown when the provincial sales tax rate is greater than 1. Message: The argument cannot be greater than 1. Parameter name: provincialSalesTaxRate.

ArgumentOutOfRangeException - Thrown when the goods and services tax rate is less than 0. Message: The argument cannot be less than 0. Parameter name: goodsAndServicesTaxRate.

ArgumentOutOfRangeException - Thrown when the goods and services tax rate is greater than 1. Message: The argument cannot be greater than 1. Parameter name: goodsAndServicesTaxRate.

+ CarWashInvoice(decimal, decimal, decimal, decimal) - Initializes an instance of CarWashInvoice with a provincial and goods, services tax rate, package cost and fragrance cost.

Parameters:

provincialSalesTaxRate - The rate of provincial tax charged to a customer.

goodsAndServicesTaxRate - The rate of goods and services tax charged to a customer.

packageCost - The cost of the chosen package.

fragranceCost - The cost of the chosen fragrance.

Exceptions:

ArgumentOutOfRangeException - Thrown when the provincial sales tax rate is less than 0. Message: The argument cannot be less than 0. Parameter name: provincialSalesTaxRate.

ArgumentOutOfRangeException - Thrown when the provincial sales tax rate is greater than 1. Message: The argument cannot be greater than 1. Parameter name: provincialSalesTaxRate.

ArgumentOutOfRangeException - Thrown when the goods and services tax rate is less than 0. Message: The argument cannot be less than 0. Parameter name: goodsAndServicesTaxRate.

ArgumentOutOfRangeException - Thrown when the goods and services tax rate is greater than 1. Message: The argument cannot be greater than 1. Parameter name: goodsAndServicesTaxRate.

ArgumentOutOfRangeException - Thrown when the package cost is less than 0. Message: The argument cannot be less than 0. Parameter name: packageCost.

ArgumentOutOfRangeException - Thrown when the fragrance cost is less than 0. Message: The argument cannot be less than 0. Parameter name: fragranceCost.

Please show how to inherit Invoice to CarWashInvoice in C# as I am currently getting a CS0534 error.

"abstract Invoice - provincialSalesTaxRate : decimal - goodsAndServicesTaxRate : decimal +> ProvincialSalesTaxRate : decimal +> GoodsAndServicesTaxRate : decimal +>> ProvincialSalesTaxCharged : decimal +> GoodsAndServicesTaxCharged : decimal +>> SubTotal : decimal +> Total : decimal +Invoice(provincialSalesTaxRate : decimal, goodsAndServicesTaxRate : decimal) CarWashlnvoice - packageCost : decimal - fragranceCost : decimal +> PackageCost : decimal +> FragranceCost : decimal +> ProvincialSalesTaxCharged : decimal +> GoodsAndServicesTaxCharged : decimal +> SubTotal : decimal +CarWashlnvoice(provincialSalesTaxRate : decimal, goodsAndServicesTaxRate : decimal) +CarWashlnvoice(provincialSalesTaxRate : decimal, goodsAndServicesTaxRate : decimal, packageCost : decimal, fragranceCost : decimal)