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If you store the Cart ID in the visitor s cookie, you ll have access to it when the visitor returns after a period of time. If the shopping cart cookie doesn t exist, it can mean that the visitor used your shopping cart for the first time, so you generate a new GUID and save it to the cookie. If the cookie exists, you take the GUID from there and use the shopping cart associated with it. What about customers that have disabled (or whose browsers don t support) cookies Well, the backup strategy is to also use the visitor s session. ASP.NET s session relies, by default, on using cookies, but by changing a simple setting, you can enable cookieless session support. An alternative option to support cookieless browsers is to append the session ID to the query string, as many popular e-commerce web sites do. Both solutions have the same effect and allow the customers to use your shopping cart even if their browsers don t support cookies (however, in this case, their shopping carts are lost if they close their browser session and return after a while, unlike when using cookies).

Application state can also be used to store frequently used information that is timeconsuming to create, such as a full product catalog that requires a database lookup. However, using application state to store this kind of information raises all sorts of problems about how to check whether the data is valid and how to replace it when needed. It can also hamper performance if the product catalog is too large. 26 introduces a similar but much more sensible approach storing frequently used information in the ASP .NET cache. Many uses of application state can be replaced more efficiently with caching.

Each state management choice has a different lifetime, scope, performance overhead, and level of support. Table 9-3 and Table 9-4 show an at-a-glance comparison of your state management options.

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You saw that the DataReader, DataSet, and SqlDataSource can be used as the data source for list binding. The SqlDataSource, though a great Web control to have in our toolbox, isn t the panacea that you may have thought it was. You saw various examples of when you need to massage it a little to get it to perform exactly as desired. In the next chapter, we ll continue our exploration of data binding by looking at table binding. You ll learn how to show the list of results in pretty much any format you require using the Repeater, DataList, and GridView. You ll also start to see the power that the GridView provides, as well as how you can implement pages that, in the past, would have required a lot of hard work to develop. Because the GridView can perform a lot of complex functions automatically, hard-working developers now have time for the finer things in life.

Allowed Data Types Storage Location All serializable .NET data types. A hidden field in the current web page.

Session handling is a great ASP.NET feature that allows you to keep track of variables specific to a certain visitor accessing the web site. While your visitor browses various pages of the web site, its session variables are persisted by the web server, and the Web Application can keep track of certain visitor data by uniquely identifying the visitor (you can track, for example, data such as the visitor ID or the visitor s favorite background color, name, email address, and so on). The visitor s session object stores pairs of values (variable name, variable value) that are accessible for the entire visitor s visit on your web site. In ASP.NET, you can access the session data through the Session object. You can use this object to preserve data between client requests. This data is stored on the server side and is not passed back and forth during requests only a session identifier is passed. This means that storing large quantities of data in the visitor s session occupies the server s memory, but doesn t increase network traffic. In this chapter, you ll only use the session to store the ID of your visitor s shopping cart.

String data. The client s computer (in memory or a small text file, depending on its lifetime settings). Set by the programmer. Can be used in multiple pages and can persist between visits. The whole ASP.NET application. Insecure, and can be modified by the user.

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