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Figure 11-2. Administering departments The functionality you ll implement for departments is much the same as you ll see for categories and products. More specifically, the administrator can Edit the department s name or description by clicking the Edit button Edit the categories for a specific department by clicking the Edit Categories button Completely remove a department from the database by clicking the Delete button (this works only if the department has no related categories; otherwise, the administrator is notified that the operation couldn t be completed) When clicking the Edit button, the grid enters edit mode, and its fields become editable TextBox controls, as shown in Figure 11-3. Also, as you can see, instead of the Edit button, you get Update and Cancel buttons. Clicking Update updates the database with the changes, whereas clicking Cancel simply quits edit mode. The administrator can add new departments by writing the new department s name and description in the TextBox controls below the grid, and clicking the Add button. When the administrator clicks the Edit Categories button, the category administration page loads up. The user is presented with a similar page where he or she can edit the categories that belong to the selected department (see Figure 11-4).

In Visual C# Express, you can assign INTEGRATE_TESTS as follows: 1 Right-click your project and select Properties 2 Click the Build tab 3 Add the INTEGRATE_TESTS value to the Conditional Compilation Symbols box..

This page works similar to the one for editing departments, but there is an additional link that takes you back to the departments page. When selecting a category, the page loads the list of products for that category (see Figure 11-5). You ll implement the products administration features in 12.

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Conditional compilation is useful when you want to include or remove code depending on a configuration. However, some programmers will frown upon having conditional compilation code within a function, as that would be a maintenance nightmare. Another solution is to use the partial class keyword in conjunction with conditional compilation statements. Thus far in all of the examples, whenever we defined a class, all of the methods and code were declared between the curly brackets of the class. By using partial classes, it is possible to declare a class in multiple places. When the C# compiler compiles the source code, the individual class pieces will be assembled into a single class definition. For our test code, we can create an implementation partial class and a conditionally compiled test partial class implementation. The following is the modified TestCurrencyTrader class that could be used to test the state without exposing the state. partial class TestCurrencyTrader : CurrencyTrader { public void InitializeExchangeRate() { ExchangeRate = 100.0; } } #if !INTEGRATE_TESTS partial class TestCurrencyTrader : CurrencyTrader { public void VerifyExchangeRate(double value) { if (ExchangeRate != value) { throw new Exception("ExchangeRate verification failed"); } } } #endif The keyword partial prefixes the class keyword. The first implementation of TestCurrencyTrader is an example of not exposing state. The second implementation of TestCurrencyTrader, which is declared in the context of a conditional compilation statement, contains the method VerifyExchangeRate(). This is a verification method that tests the ExchangeRate property for a particular value.

Figure 11-5. Administering products Finally, the last page allows you to do additional product details management, such as changing the product s category, removing a product from a category or from the catalog, and so on (see Figure 11-6). The navigation logic between the department, category, and product administration pages is done using query string parameters.

cannot be used across assembly boundaries. When I say single assembly, I am referring to the compiled pieces of .NET source code illustrated in 1. In other words, if you define a partial class in a library, then all pieces of the partial class need to be defined in the library.

Before building any administrative pages, we need to put in place a security mechanism for restricting the access to these pages. Only authorized personnel should be able to modify the product catalog! Security is obviously a large topic, and its complexity depends a lot on the value of the data you re protecting. While we don t have the resources to create such a secure environment as that implemented by banks, for example, when creating an online store, we still have a great responsibility to make sure our data and our customers data is safe.

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