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that the base class functionality will be called. It implies that you might call the base class functionality and perform some additional operations. Thus, when designing base class functionality, it is important to track calculations or operations using protected data members. The data members avoid having derived classes perform the same operations multiple times, slowing down the application and avoiding potential errors.

int int nvarchar(50) nvarchar(1000)

Namespaces are used to define blocks of functionality that belong together. You will need to use namespaces in the case of tax engines, because there would be an American tax engine, Swiss tax engine, and so on, and each should have its own namespace. Sometimes you might even create a custom assembly for each set of interface implementations, but you would still need to create a namespace. Creating a namespace is independent of the fact of whether or not you create a separate assembly. In the examples, I use namespaces like LibTax.Surtax and LibTax.Canada. These namespaces are typically created by adding folders using the Add New Folder context menu item in the Solution Explorer of Visual Studio.

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Essentially, creating the Category table is pretty much the same as the Department table you ve already created, so we ll move pretty quickly. What makes this exercise special is that you ll learn how to implement and enforce the One-to-Many relationship between the Category and Department tables.

The source code examples don t illustrate the using keyword and assume that you have created them at the beginning of the source code. You can take a look at the source code and inspect the namespaces to see how they are used.

1. Using Database Explorer (Ctrl+Alt+S), open the data connection to the BalloonShop database. When the database is selected, choose Data Add New Table. Alternatively, you can right-click the Tables node under BalloonShop and select Add New Table. 2. Add the columns shown in Table 5-1. The table should look as shown in Figure 5-5.

Integer Tolerance Must Be a Number Between 0 and 100: This error message appears because the Tolerance box s value is less than 0 or greater than 100. To correct this problem, type a value equal to or between 0 and 100 in the Tolerance box. Convergence Must Be a Small Positive Number: This error message appears because the Convergence 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 Convergence box.

Take a good look at the scope declaration of the tax engine shown earlier and compare it with the scope declaration for the ITaxEngine interface. What you will notice is that ITaxEngine is declared as public scope, as is BaseTaxEngine, and TaxEngine is declared as internal. Going back to our project structure, this scope declaration implies that any reference to LibTax will see the interface ITaxEngine and BaseTaxEngine, but not TaxEngine. For example, the following test code will not work. ITaxEngine taxengine = new LibTax.Surtax.TaxEngine();

Tip A quick reminder from the previous chapter: You set a column to be the primary key by right-clicking on it and clicking the Set Primary Key item from the context menu. You set it to be an identity column by expanding the Identity Specification item from its Column Properties window, and setting the (Is Identity) node to Yes. At this moment the form should look like Figure 5-5.

Figure 5-5. Creating the Category table 3. Press Ctrl+S to save the table. When asked, type Category for the table s name. 4. While the Category table is still selected, click Table Designer Relationships. Here is where you specify the details for the foreign key. This works by relating a column of the referencing table (Category) to a column of the referenced table (Department). You need to relate the DepartmentID column in Category with the DepartmentID column of the Department table. 5. In the dialog box that appears, click Add. 6. Select the Tables and Columns Specifications entry and click the ... button that appears. In the dialog box that opens (see Figure 5-6), choose Department for the Primary key table and DepartmentID for the column on both tables.

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