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In the base class implementation, the data member _calculatedTaxable is declared as protected. As you learned in the previous chapter, this means that _calculatedTaxable can be manipulated in a derived class. However, if you look at how the data member is used, you will see that only CalculateTaxToPay() assigns the data member. The purpose of the data member is to provide information about the operation CalculateTaxToPay() without giving the exact details of the operation. The idea behind _calculatedTaxable and the declaration of CalculateTaxToPay() is to provide a mechanism where the derived class does not need to calculate things again. Consider the example of a country where, if your taxable income is above 400 currency units, a surtax of 10 currency units is calculated. You don t know what your taxable income is until the function CalculateTaxToPay() is executed, and that function returns only the total payable taxes. So how do you know if you should apply the surtax in this situation One solution is to reverse-calculate the payable taxes, but that would involve quite a few additional steps. An easier solution is to write some code in the base class method of CalculateTaxToPay() that stores the taxable income so the subclass has access to it. The original implementation of CalculateTaxToPay() does not consider a surtax, so the derived class must contain that functionality. Since CalculateTaxToPay() can be overridden without the data member _calculatedTaxable, the derived class would need to implement the functionality in the base class to calculate whether or not the surtax applies. Following is an example derived class implementation of the tax engine for such a situation, stored in a namespace called LibTax.Surtax, to distinguish it from the base functionality.

SQL Server Books Online defines a foreign key as a column or combination of columns used to establish or enforce a link between data in two tables (usually representing a One-toMany relationship). Foreign keys are used both to ensure data integrity and to establish a relationship between tables.

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To enforce database integrity, the foreign keys, like the other types of constraints, apply certain restrictions. Unlike PRIMARY KEY and UNIQUE constraints that apply restrictions to a single table, the FOREIGN KEY constraint applies restrictions on both the referencing and referenced tables. For example, when enforcing a One-to-Many relationship between the Department table and the Category table by using a FOREIGN KEY constraint, the database includes this relationship as part of its integrity. The foreign key won t allow you to add a category to a nonexistent department, and it won t allow you to delete a department if categories belong to it. You now know the general theory of foreign keys. You ll implement them in the following exercise, where you ll have the chance to learn more about how foreign keys work. A bit later, you ll learn how to visualize and implement foreign keys using the integrated diagramming feature in Visual Web Developer.

namespace LibTax.Surtax { internal class TaxEngine : BaseTaxEngine { public override double CalculateTaxToPay(ITaxAccount account) { double taxToPay = base.CalculateTaxToPay(account); if (_calculatedTaxable > 400) { taxToPay += 10; } return taxToPay; } public override ITaxAccount CreateTaxAccount() { throw new Exception("The method or operation is not implemented."); } } } In the implementation of CalculateTaxToPay(), we replace the virtual keyword with override, implying that the functionality of TaxEngine replaces the functionality of BaseTaxEngine. However, if TaxEngine is called, and the TaxEngine.CalculateTaxToPay() implementation is empty, then tax is not calculated. Since our fictional country calculates the basic tax similarly to most countries, the functionality of BaseTaxEngine.CalculateTaxToPay() can be used. Thus, the first line of TaxEngine.CalculateTaxToPay() is base.CalculateTaxToPay(), meaning the base class (BaseTaxEngine) method CalculateTaxToPay() is called. Calling the base class results in calculating a basic tax to pay amount. We need to figure out if a surtax applies, and that is where the protected data member _calculatedTaxable comes into play. Having called BaseTaxEngine.CalculateTaxToPay(), the data member _calculatedTaxable is assigned and contains the amount that is being taxed. Thus, TaxEngine. CalculateTaxToPay() can make a decision if more than 400 currency units have been earned. And if so, then the variable taxToPay is incremented with another 10 currency units. Had _calculatedTaxable not existed, TaxEngine.CalculateTaxToPay() would have needed to call the base class functionality to get the basic tax rate, and then recalculate the taxable monies to figure out if the surtax applied.

In the following exercises, you ll put into practice the new theory you learned on table relationships by creating and populating these tables: Category Product ProductCategory

Note When you override methods, you are saying that you need something special. This does not imply

The process of creating the Category table is pretty much the same as for the Department table you created in 3. The Category table will have four fields, as described in Table 5-1.

The Solver Options dialog box s most common error messages include the following: Max Time Must Be a Positive Number: This error message appears because the Max Time box s value is less than 1. To correct this problem, type a value of 1 or greater in the Max Time box. Iterations Must Be a Positive Number: This error message appears because the Iterations box s value is less than 1. To correct this problem, type a whole number value of 1 or greater in the Iterations box. Precision Must Be a Small Positive Number: This error message appears because the Precision box s value is less than or equal to 0 or greater than or equal to 1. To correct this problem, type a fractional number between 0 and 1 in the Precision box.

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