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The implementation of ITaxDeduction is similar to ITaxIncome: sealed class TaxDeduction : ITaxDeduction { double _amount; public TaxDeduction(double amount) { _amount = amount; } public double Amount { get { return _amount; } } } TaxIncome and TaxDeduction are sealed classes because the functionality will be shared among implementations. But is it wise to expose the interfaces and not the classes themselves Interfaces are used to separate implementation from ideas. Interfaces change very little, whereas implementations can and will change more often. But if an implementation behaves like an interface in terms of changing interface signature, why not just expose the class itself The answer is that sometimes you will expose the class, and sometimes you will expose the interface. For the tax engine, exposing the sealed classes TaxIncome and TaxDeduction would probably have been fine. The rule of thumb is that you expose classes only when you are sure that the interface signatures of methods and properties will not change very often.

This message usually appears because you may have omitted one or more constraints when you set up the model To address this problem, check the current worksheet values to see how the solution is diverging, recheck the constraints, and then run Solver again Solver Could Not Find a Feasible Solution: This message is displayed when Solver cannot find a proposed solution that satisfies all of the model s constraints while still achieving the Solver Options dialog box s Precision setting This message usually appears due to inconsistent constraints To address this problem, examine the worksheet for a possible mistake in the constraints formulas or in the choice of constraints Solver Stopped at User s Request: This message is displayed when you click the Show Trial Solution dialog box s Stop button, either when stepping through trial solutions or after pressing the Esc key to interrupt the solution process..

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Although not yet full-featured, at the conclusion of this phase your site will have a fully functional, searchable product catalog, and will be capable of accepting PayPal payments, enabling you to begin generating revenue immediately Phase 2 concentrates on increasing revenue by improving the shopping experience In this phase, you ll learn how to encourage customers to buy more by implementing a dynamic product recommendation mechanism You ll also implement your own custom shopping cart, replacing that provided by PayPal In the third phase, we ll show you how to increase your profit margins by reducing costs through automating and streamlining order processing and administration, and by handling credit card transactions yourself You ll also learn how to integrate external functionality through web services (with a practical example of integrating Amazoncom products in your site), and improve your customer s shopping experience by adding product review functionality.

The ITaxAccount interface is also a candidate for base class functionality. The implementation of this interface looks like this: abstract class BaseTaxAccount : ITaxAccount { ITaxDeduction[] _deductions; ITaxIncome[] _incomes; public BaseTaxAccount() { _deductions = new ITaxDeduction[ 100]; _incomes = new ITaxIncome[ 100]; } public void AddDeduction(ITaxDeduction deduction) { for( int c1 = 0; c1 < 100; c1 ++) { if( _deductions[ c1] == null) { _deductions[ c1] = deduction; break; } } }

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public void AddIncome(ITaxIncome income) { for( int c1 = 0; c1 < 100; c1 ++) { if( _incomes[ c1] == null) { _incomes[ c1] = income; break; } } } public ITaxDeduction[] Deductions { get { return _deductions; } } public ITaxIncome[] Income { get { return _incomes; } } public abstract double GetTaxRate(double income); } Let s take stock of what has been accomplished and decide if the tax engine is complete from a base functionality perspective. Ideas have been defined for a complete tax engine. Some interfaces have been implemented in the form of base classes. Some interfaces have been implemented as sealed default implementations. The tax engine can be considered complete because all of the interfaces have been defined and accounted for from a base functionality perspective as either base classes or default implementations. It is does not mean that interfaces will always be implemented. Sometimes some interfaces will not have a base functionality or base classes. The important aspect to remember when defining the base functionality is to account for all interfaces to serve a purpose. Do not define an interface as a placeholder for potential future functionality. A user when seeing an interface expects it to serve some type of purpose.

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