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Note When using the StateServer and SQLServer modes, the objects you store in session state must be serializable. Otherwise, ASP.NET will not be able to transmit the object to the state service or store it in the database. Earlier in this chapter, you learned how to create a serializable Customer class for storing in view state.

The return and cancel_return parameters specify the web pages to return to after the payment is made or canceled. Figure 7-4 shows the PayPal Single Item Purchase screen.

This setting disables session state management for every page in the application. This can provide a slight performance improvement for websites that are not using session state.

In comparison to inline binding, list binding is a somewhat less complex way to pass data into a data-bound Web control, but usually it requires more work beyond the call to DataBind() to finesse your Web control into a useful piece of the page for the user. If you consider the four Web controls you can list-bind to the CheckBoxList, RadioButtonList, DropDownList, and ListBox you can see that their purpose is to elicit a response from the user for information to be used elsewhere in the page.

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With this setting, ASP.NET will use a separate Windows service for state management. This service runs on the same web server, but it s outside the main ASP .NET process, which gives it a basic level of protection if the ASP.NET process needs to be restarted. The cost is the increased time delay imposed when state information is transferred between two processes. If you frequently access and change state information, this can make for a fairly unwelcome slowdown. When using the StateServer setting, you need to specify a value for the stateConnectionString setting. This string identifies the TCP/IP address of the computer that is running the StateServer service and its port number (which is defined by ASP.NET and doesn t usually need to be changed). This allows you to host the StateServer on another computer. If you don t change this setting, the local server will be used (set as address 127.0.0.1). Of course, before your application can use the service, you need to start it. The easiest way to do this is to use the Microsoft Management Console (MMC). Select Start Programs Administrative Tools Computer Management. (You can also access the Administrative Tools group through the Control Panel.) Then select the Services and Applications Services node. Find the service called ASP.NET State Service in the list, as shown in Figure 9-13.

Summary

Client-side caching is less common than server-side caching. Because the page is still recreated for every separate user, it won t reduce code execution or database access nearly

Note There is a fifth Web list control, the BulletedList, which is more of a display-only Web control

as dramatically as server-side caching (which shares a single cached copy among all users). However, client-side caching can be a useful technique if your cached page uses some sort of personalized data. Even though each user is in a separate session, the page will be created only once and reused for all clients, ensuring that most will receive the wrong greeting. Instead, you can either use fragment caching to cache the generic portion of the page or use client-side caching to store a user-specific version on each client s computer.

In this chapter, you saw how to integrate PayPal into an e-commerce site a simple payment solution that many small businesses choose so they don t have to process credit card or payment information themselves. First we listed some of the alternatives to PayPal, before guiding you through the creation of a new PayPal account. We then covered how to integrate PayPal in stages 1 and 2 of development, first discussing a shopping cart, a custom checkout mechanism, and then how to direct the visitor straight to the payment page. In the next chapter, we ll move on to look at a catalog administration page for BalloonShop.

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