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Figure 13-3. The shopping cart administration page We use cookies to keep track of shopping carts. When the visitor clicks the Add to Cart button, the server first verifies whether a shopping cart cookie already exists on the visitor s computer. If it does, the specified product is added to the existing cart. Otherwise, the server generates a unique cart ID, saves it to the client s cookie, and then adds the product to the newly generated shopping cart.

< xml version="1.0" encoding="utf-8" > <configuration> <configSections> <section name="loader" type="Definitions.LoaderSection,Definitions" /> </configSections> <appSettings> <add key="Assemblies" value="Impl1,Implementations1.Implementation,Implementations1.dll, Impl2,Implementations2.Implementation,Implementations2.dll" /> </appSettings> <loader easyname="Impl1" typename="Implementations1.Implementation" assemblyname="Implementations1.dll" /> </configuration> The bolded section represents a new part of the configuration file that could be called configuring the configuration. Any XML node that is within the <configSections> section is used to customize the configuration-parsing infrastructure. In the example, the XML node <section> has two attributes that refer to what the configuration infrastructure should do when it encounters a specific XML node. The attribute name specifies the name of the XML node, and the attribute type references a type (Definitions.LoaderSection) and assembly (Definitions) that will process the XML node. Step back and think about what is happening here. The XML node <section> is used to configure the configuration processor using dynamically loaded types. This demonstrates that the process of dynamically loading and executing pieces of code is not rocket science, but a daily part of developing components in .NET. Since configuring the configuration infrastructure uses the same techniques as our infrastructure, implementing functionality for the configuration infrastructure implies implementing standard types. In our code, the type Implementations1.Implementation implemented an interface, whereas in the configuration infrastructure, we need to subclass a predefined class. Either approach is acceptable, and as you will see, subclassing a predefined type offers a particular advantage.

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You ll store all shopping cart items in a single table, named ShoppingCart. You can create the new table by either following the steps in the next exercise or by simply executing the SQL script available from the Source Code page on the Apress web site (http://www.apress.com). Remember that you can also create your table and implement the relationship using database diagrams, as shown in 5. Follow the steps in the next exercise if you prefer to create your new table manually.

To display rows that contain only specific cell values, follow these steps: a. Click the arrow in the column that contains the values, and then click (Custom). b. In the left list, select Equals, Does Not Equal, Contains, Does Not Contain, or another comparison option. c. In the box on the right, enter the value you want.

When you want to use a custom node in a configuration file, you need to implement a class that subclasses System.Configuration.ConfigurationSection. The purpose of the custom class is to process and structure the data in the configuration file into something that the user can manipulate. In other words, we are marshaling the data from the configuration file to the .NET environment. The .NET infrastructure helps you implement the marshaling routines by providing class types that allow you explicitly associate an XML attribute or keyword with some variable. For example, suppose you want to cross-reference the XML attribute easyname with a .NET type. To do so, first define the nature and type of the property using the type ConfigurationProperty: _propEasyName = new ConfigurationProperty( "easyname", typeof(string), null, ConfigurationPropertyOptions.IsRequired);

1. In Database Explorer, expand your BalloonShop database, right-click Tables, and choose Add New Table. 2. Add new columns to your new table, as shown in Figure 13-4.

stores the date with less precision than datetime (down to minutes), but occupies 4 bytes instead of 8.

This example uses the ConfigurationProperty constructor that has four parameters: "easyname": Identifies the XML attribute identifier that will be cross-referenced. typeof(string): Identifies the type of the attribute, which could also include double and int to indicate a number. null: Identifies the default value of the attribute if the attribute does not exist. ConfigurationPropertyOptions.IsRequired: Identifies some characteristics of the attribute; in the case of this example, the attribute is required.

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