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One of the main considerations in caching is deciding when a page can be reused and when information must be accurate up to the latest second Developers, with their love of instant gratification (and lack of patience), generally tend to overemphasize the importance of real-time information You can usually use caching to efficiently reuse slightly stale data without a problem and with a considerable performance improvement Of course, sometimes information needs to be dynamic One example is if the page uses information from the current user s session to tailor the user interface In this case, full page caching just isn t appropriate, because the same page can t be reused for requests from different users (although fragment caching may help) Another example is if the page is receiving information from another page through the query string.

and doesn t allow the user to select options from the list. Even though we re not going to look at it here, the method for populating the Web control is the same as for the other four Web controls.

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In this case, the page is too dynamic to cache or is it The current example sets the VaryByParam attribute on the OutputCache directive to None, which effectively tells ASPNET that you need to store only one copy of the cached page, which is suitable for all scenarios If the request for this page adds query string arguments to the URL, it makes no difference ASP NET will always reuse the same output until it expires You can test this by adding a query string parameter manually in the browser window For example, try tacking a=b on to the end of your URL The cached output is still used Based on this experiment, you might assume that output caching isn t suitable for pages that use query string arguments But ASPNET actually provides another option.

You can set the VaryByParam attribute to * to indicate that the page uses the query string and to instruct ASPNET to cache separate copies of the page for different query string arguments:.

he final detail to take care of before launching BalloonShop is to create the administrative interface. In the previous chapters, you worked with catalog information that already existed in the database. You ve probably inserted some records yourself, or maybe you downloaded the department, category, and product information from the Source Code area of the Apress web site. Obviously, for a real web site, both ways are unacceptable, so you need to write some code to allow easy management of the web store data. In this chapter, you ll implement a catalog administration page. With this feature, you complete the first stage of your web site s development! Because this page can be done in many ways, a serious discussion with the client is required to get the specific list of required features. In our case, the catalog administration page should allow the client to Add or remove departments, and update the details of existing departments View and manage the categories that belong to a department Manage the list of products in a specific category, and edit product details Assign an existing product to an additional category (a product can belong to multiple categories), or move it to another category Remove a product from a category or delete the product from the catalog The administration page also needs to ask for a username and password, so that only the site administrator is allowed to perform administrative tasks.

As you know from using these Web controls and working with HTML option lists, the key to finding out what the user has chosen is to establish a unique value for each option that can be retrieved from the page once the choice has been made. And, of course, you also need some text to display against each choice. In HTML, that means something like this: <select name="ListBox1" size="5" id="ListBox1"> <option value="1">Apple</option> <option value="2">Creative</option> <option value="3">iRiver</option> <option value="4">MSI</option> <option value="5">Rio</option> </select> On the screen, it looks something like Figure 6-8.

Now when you request the page with additional query string information, ASP.NET will examine the query string. If the string matches a previous request and a cached copy of that page exists, it will be reused. Otherwise, a new copy of the page will be created and cached separately. To get a better idea of how this process works, consider the following series of requests:

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