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Figure 2-6. Dissecting the addition operation In the code, parameters are used to specify the input data. Each parameter represents one of the numbers to be added. In the declaration of Add(), the return parameter is the identifier int, which is the integer data type. Methods and parameters must be associated with a type, as C# is a type-safe programming language. Type-safe means that when you write code, you know what you are manipulating. Suppose that you are writing code and are confronted with the numbers 1, 1.0, and "1.0". To you, these three numbers are identical. But in the context of the source code, they are not identical. The 1 is an integer, the 1.0 is a double, and the "1.0" is a string. When you want to add, subtract, or otherwise manipulate pieces of data, they should be the same types; otherwise, you might run into consistency errors. Type-safe programming languages help avoid such problems. The .NET number types are discussed in more detail in the Understanding the CLR Numeric Types section later in this chapter. The declaration of Add() says that we need to pass in two integer-based numeric values, and the method returns an integer-based numeric value. The combination of parameters and a return type is a method signature. The method signature becomes important when another

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 12-3).

piece of code calls the Add() method. The other piece of code must use the same types as the declaration. Figure 2-7 shows a piece of code that calls the Add() method, which we ll do from another application in the next section.

Figure 12-3. Administering product details The interface is a bit more complex, but the theory isn t much more complicated than what you re already used to. You just need to display the products that belong to a selected category and allow the user to add new products to that category. The product-deleting feature is offered via a separate page, so you won t see a Delete link here.

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Figure 2-7. The Add() method is called by referencing the namespace and class containing the method. A period is used to separate the identifiers. The caller must do two things: Reference the correct combination of namespace, class, and method identifiers. Pass the correct types for the method signature. In the example, the addition of 1 and 2 results in 3, and therefore the variable total should contain the value of 3 (the equal sign assigns the value returned from the method to the variable on its left). I say should contain the value, because when writing code, you are not always sure. Sometimes the code you write will be wrong because you overlooked something or forgot to reference something. Look at the calling code, and ask yourself if you are guaranteed that calling Add() with 1 and 2 will result in 3. The answer is that, as a caller, you cannot be 100% sure that the total variable will contain 3. Just because a box has the label Dishes does not necessarily mean that dishes are in the box. You think you know the contents, but you cannot be 100% sure until you open the box. Likewise, in code, you need to look at how the Add() method is implemented to be sure of the contents of the total variable. In a production coding session, looking at the implementation code to verify it is doing what you expect is not a feasible solution, because that would take too much time and be completely unreliable. The only real solution is to write test code.

You ll create the products administration interface in the next exercise. You ll start by creating the stored procedures that support the user interface functionality: CatalogGetAllProductsIncategory, CatalogCreateProduct, and CatalogUpdateProduct. Next you ll create the business tier methods that work with these procedures, and finally you ll implement AdminProducts.aspx, the Web Form that implements the features described in Figures 12-1 and 12-2.

To consolidate data by position or by category, follow these steps: 1 Set up the data to be consolidated by making sure that each separate cell group s column has a label in the first row and contains similar facts, and there are no blank rows or columns within the list 2 Make sure each cell group is on its own worksheet Do not put any of the separate cell groups on the worksheet where you want to put the consolidated cell group 3 Check for the following similarities in the data: If you re consolidating data by position, make sure that each separate cell group has the same basic layout If you re consolidating data by category, make sure that each of the separate cell groups column and row labels have identical spelling and capitalization 4 Give each cell group a unique defined name.

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