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1. Open the Category table for editing (right-click the table in Database Explorer and select Show Table Data). 2. Using the editor integrated with Visual Web Developer, you can start adding rows. Because CategoryID has been set as an identity column, you cannot manually edit its data SQL Server automatically fills this field for you. However, you ll need to manually fill the DepartmentID field with ID values of existing departments. Alternatively, you can populate the Category table using the scripts from the code archive of this book (which can be downloaded from the Source Code section of the Apress web site, at http://www.apress.com). Add categories as shown in Figure 5-7. 3. Now try to break the database integrity by adding a category to a nonexistent department (for example, set the DepartmentID to 500). After filling the new category data, try to move to the next row. At this point, Visual Web Developer submits the newly written data to SQL Server. If you ve created the relationship properly, an error should occur (see Figure 5-8). For more detailed information about the error, click the Help button.

The first thing I would like to say about Canadian taxes is that Canadians pay too much way too much. The second comment is that Canadian taxes are simple, in that they don t let you write off many deductions (for example, interest payments on your house), which brings us back to the first point that Canadians pay way too much. Of course, people in other countries would probably say the exact same thing. Canadian taxes are based on calculating the tax rate at the federal level and at the provincial level. Thus, to calculate your taxes, you need to know in which province and in which year you are paying your taxes. Canadian taxes change quite a bit depending on the year. From an implementation perspective, it means the tax engine must know about provincial taxes, federal taxes, and which year. Capital gains in Canada are calculated on a 50% basis. This means if I made a capital gain of 200 Canadian dollars, then only 100 Canadian dollars are declared as taxable monies.

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Tip Keep the CategoryID numbers in sequential order to make your life easier when associating them

Solver can also display this message when there is an error in one of the cells on the right-hand side of a constraint For example, if you have a constraint A1:A2 >= B1:B2, and B2 contains a #VALUE value, this message may appear Solver Encountered an Error Value in a Target or Constraint Cell: This message is displayed when Solver discovers an error value after its latest calculation To address this message, find the target cell or constraint cell that contains the error, and do one of the following: Change the constraint cell s formula to return an appropriate numeric value Make sure the constraints names and formulas are valid in the Add Constraint dialog box for each constraint Make sure you did not type Integer, Int, Binary, or Bin in any of the constraints Add Constraint dialog boxes Constraint boxes.

Implementing a Canadian tax engine means deriving a class from BaseTaxEngine, and that means implementing the CreateTaxAccount() method. The implementation of the Canadian tax engine implies creating a new namespace, and a good name would be LibTax.Canada. The code will not show the namespace details, as they are implied. The implementation is as follows: internal class TaxEngine : BaseTaxEngine { public override ITaxAccount CreateTaxAccount() { return new TaxAccount(); } } In the implementation of the CreateTaxAccount() method, the TaxAccount class is instantiated. TaxAccount is a class that derives from BaseTaxAccount and thus implements the ITaxAccount interface. The implementation of TaxAccount is as follows: internal class TaxAccount : BaseTaxAccount { Province _province; int _year; public TaxAccount() { } public override double GetTaxRate(double income) { if (_year == 2007) {

with product IDs later in this chapter. Remember that you can use the TRUNCATE TABLE command to empty the table s contents and reset the identity value.

if (_province == Province.Ontario) { return OntarioTax2007.TaxRate(income); } } throw new NotSupportedException("Year " + _year + " Province " + _province + " not supported"); } } The purpose of the GetTaxRate() method is to return the applicable tax rate for the given amount. In Canada, the tax rate is determined by which province you live in and the year. The calculation in GetTaxRate() has the ability to calculate the taxes for the year 2007 in the Ontario province. Yet there is a problem, and it involves the data members _province and _year. The data members are used in the calculation GetTaxRate(), but they are not assigned. This is a problem.

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