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In the bolded code, there is a reference to another namespace, type, and method with a pair of parentheses. This is called making a method call on a static class and static method. This says that the implementation of the method is the calling of another method. Notice how the other method is referenced using both namespace and type identifiers. This is how all types and methods are always referenced. A namespace identifier is only necessary if the type (for example, class) is not defined in the current namespace. If you have namespaces with long names, this referencing can get tedious. As an alternative, you can add a using statement to reference the namespace, similar to the following. using MyMainTypes; namespace MyOtherMainTypes { static class AnotherType { public static void DoSomething() { AType.DoSomething(); } } } The using statement says that if the code references any types that are not defined locally, look in this namespace (MyMainTypes in the example) to find the type. Note that if you use using two namespaces that have identically named types, then referencing that type will result in a compiler failure, because it won t know which type to reference. This covers the absolute basics of writing some code, and we are ready to write some code to do something.

Summary

You ve done a lot of coding in this chapter. You implemented one Master Page and two Web Forms based on it AdminDepartments and AdminCategories along with their middle-tier methods and stored procedures. You learned how to implement a simple authentication scheme so only administrators are allowed to access the catalog administration page. You made contact with the GridView, which is probably the most powerful web control that comes packaged with the .NET Framework. You learned how to use the GridView s built-in features for editing, selecting, updating, and deleting records. You also learned how to use template columns to improve its functionality. In the next chapter, we ll implement the remaining administrative features: the management of products.

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We ll write the code to add two numbers. To begin, create a new project in Visual C#: 1. Open Visual C# (if Visual C# is open, choose File Close Solution to ensure you have a clean slate). 2. Click File New Project or choose Create: Project. 3. Choose Class Library, name it Calculator, and click OK. 4. Rename Class1.cs to Calculator.cs. 5. Save the solution. We can now write the Add() method. Add the bolded code to the Calculator.cs file. using System; using System.Collections.Generic; using System.Text; namespace Calculator { public class Calculator { }

our administrators are now able to edit the departments and categories of your e-commerce web site. In this chapter, we add the missing features relating to managing products. More specifically, we will implement features in this chapter that will allow the site administrator to accomplish the following: Viewing the list of products in a specific category Editing product details, such as the product s name, description, price, or whether or not it is on promotion Assigning an existing product to an additional category (a product can belong to multiple categories) or moving it to another category Removing a product from a category Deleting a product from a catalog Allowing administrators to access the department, category, or product administration pages right from the catalog There s quite a bit to go through, but not much more than what you ve had to endure in the previous chapter. Feel free to look ahead at the figures to see the visual appearance of the new features. Let s start!

public class Operations { public static int Add(int number1, int number2) { return number1 + number2; } } } Figure 2-6 breaks down the various parts of the Add() method so you can see what it all means.

formula without typing the reference, type the formula up to the point where you need the reference, such as =SUM(, select cells C1 through C3, and then return to the cell with the =SUM(Sheet2!C1:C3 reference displayed to enter additional cells. Be sure to type a comma between each cell value or group of cell values (for example, =SUM(Sheet2!C1:C3,Sheet1!F8).

You re now ready for the next major part of the catalog administration page: the place where you edit the products that belong to the selected category. This one has a few more controls than the others, as shown in Figure 12-1. When editing a product, the page will look similar to Figure 12-2.

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