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In some cases, you may find that you can t cache an entire page, but you would still like to cache a portion that is expensive to create and doesn t vary frequently (like a list of categories in a product catalog). One way to implement this sort of scenario is to use data caching to store just the underlying information used for the page. You ll examine this technique in the next section. Another option is to use fragment caching. To implement fragment caching, you need to create a user control for the portion of the page you want to cache. You can then add the OutputCache directive to the user control. The result is that the page will not be cached, but the user control will. Fragment caching is conceptually the same as page caching. It has only one catch if your page retrieves a cached version of a user control, it cannot interact with it in code. For example, if your user control provides properties, your web page code cannot modify or access these properties. When the cached version of the user control is used, a block of HTML is simply inserted into the page. The corresponding user control object is not available.

Because you want only certain persons to access the catalog administration page, you need to implement some sort of security mechanism that controls access to the sensitive pages in the site. Implementing security implies dealing with two important concepts: authentication and authorization. Authentication is the process in which users are uniquely identified (most often by supplying a username and password); authorization refers to which resources the authenticated user can access.

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One problem with output caching is that you need to embed the instruction into the page either in the .aspx markup portion or in the code of the class. Although the first option (using the OutputCache directive) is relatively clean, it still produces management problems if you create dozens of cached pages. If you want to change the caching for all these pages (for example, moving the caching duration from 30 to 60 seconds), you need to modify every page. ASP.NET also needs to recompile these pages. ASP.NET 2.0 introduces a new option that s suitable if you need to apply the same caching settings to a group of pages. This feature, called cache profiles, allows you to define the caching settings in a web.config file, associate a name with these settings, and then apply these settings to multiple pages using the name. That way, you have the freedom to modify all the linked pages at once simply by changing the caching profile in the web.config file. To define a cache profile, you use the <add> tag in the <outputCacheProfiles> section, as follows. You assign a name and a duration.

Figure 6-10. Selecting a single value using a DropDownList 11. Now that you ve seen how this works with a DropDownList, you can experiment with both the RadioButtonList and ListBox to perform the same task. Switch back to Visual Web Developer and change the <asp:DropDownList> and </asp:DropDownList> tags to <asp:RadioButtonList> and </asp:RadioButtonList>. Save the page, and then view it in the browser. Selecting a Manufacturer from the radio button list will post back to the server and populate the Players automatically, as shown in Figure 6-11. 12. Switch back to Visual Web Developer and change the <asp:RadioButtonList> and </asp:RadioButtonList> tags to <asp:ListBox> and </asp:ListBox>. Save the page, and view it in the browser. Selecting a Manufacturer from the list box will post back to the server and populate the Players automatically, as shown in Figure 6-12. 13. Switch back to Visual Web Developer and revert back to using a DropDownList by changing the <asp:ListBox> and </asp:ListBox> tags to <asp:DropDownList> and </asp:DropDownList>.

<configuration> <system.web> <caching> <outputCacheSettings> <outputCacheProfiles> <add name="ProductItemCacheProfile" duration="60" /> </outputCacheProfiles> </outputCacheSettings> </caching> ... </system.web> </configuration>

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