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DataReaders are quick and fast, but they re much like pay-per-view television. The only way to watch a film again once you ve finished watching it is to go back to the channel and request it again. A DataSet, on the other hand, works like a video recorder; you can record the film off the television and watch it as many times as you like, rewinding and fast-forwarding through it as much as you like. With a DataSet, you can store any data that you may have use for throughout the lifetime of a page. This idea of persisting data away from the database is known as disconnected data. In fact, it s even better than a video recorder, because once you have data inside a DataSet, you can alter that data, add to it, delete from it, and send all the changes back to the database relatively easily. This is handy (don t you wish you could do that with some movies ).

4. Another user requests the page with ProductID=1. If the cached output B has not expired, it s sent to the user. 5. The user then requests the page with no query string parameters. If copy A has not expired, it s sent from the cache. You can try this on your own, although you might want to lengthen the amount of time that the cached page is retained to make it easier to test.

Note Try updating each of the other controller action templates so the correct section is highlighted.

s Note Output caching works well if the pages depend only on server-side data (for example, the data in a

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Templates are defined using <ItemTemplate>. The DataList in the previous example has the following <ItemTemplate> defined: <asp:DataList ID="DataList1" runat="server" DataSourceID="SqlDataSource1"> <ItemTemplate> <asp:Label ID="PlayerIDLabel" runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.PlayerID") %>'> </asp:Label> <asp:Label ID="PlayerNameLabel" runat="server" Text='<%# Eval("PlayerName") %>'> </asp:Label> <asp:Label ID="PlayerManufacturerIDLabel" runat="server" Text='<%# Eval("PlayerManufacturerID") %>'> </asp:Label> <asp:Label ID="PlayerCostLabel" runat="server" Text='<%# Eval("PlayerCost") %>'> </asp:Label> <asp:Label ID="PlayerStorageLabel" runat="server" Text='<%# Eval("PlayerStorage") %>'> </asp:Label> </ItemTemplate> </asp:DataList> If you look at the source for the page, you ll see that the Repeater has exactly the same <ItemTemplate> defined, yet it displays the data differently on the page. As the DataList understands rows, it shows each item template on its own row (we ll look at how it does this shortly).

database) and the data in the query string. However, output caching doesn t work if the page output depends on user-specific information such as session data or cookies, because there s no way to vary caching based on these criteria. Output caching also won t work with dynamic pages that change their content in response to control events. In these situations, use fragment caching instead to cache a portion of the page, or use data caching to cache specific information. Both techniques are discussed later in this chapter.

You can check what the value needs to be by checking the header.tpl file. Specifically, you will need to update each of the files in the ./templates/account directory to use {include file='header.tpl' section='account'} rather than {include file='header.tpl'}. This is fairly simple to test, since you only need to visit each page and check that the navigation is highlighted properly. Alternatively, you can download the source code for this chapter.

Setting VaryByParam to the wildcard asterisk (*) is unnecessarily vague. It s usually better to specifically identify an important query string variable by name. Here s an example: <%@ OutputCache Duration="20" VaryByParam="ProductID" %> In this case, ASP.NET will examine the query string, looking for the ProductID parameter. Requests with different ProductID parameters will be cached separately, but all other parameters will be ignored. This is particularly useful if the page may be passed additional query string information that it doesn t use. ASP.NET has no way to distinguish the important query string parameters without your help. You can specify several parameters as long as you separate them with semicolons: <%@ OutputCache Duration="20" VaryByParam="ProductID;CurrencyType" %> In this case, ASP.NET will cache separate versions, provided the query string differs by ProductID or CurrencyType.

However, the Repeater doesn t really understand anything, so it simply puts each item template one directly after another, and you can t see where one row ends and the next one begins You can define several kinds of row templates for the DataList and Repeater, and we ll get to them in a minute The basic one is the ItemTemplate, as shown here You can think of each template as a mini-page where you can place any combination of text, HTML, Web controls, and, most important, instructions on how and where to bind the columns in the data source in that row When the call to DataBind() is made (either directly in code or automatically as part of the page life cycle), the mini-page template is repeated for each row in the data The ItemTemplate in the example is simple.

The following example uses two web pages to demonstrate how multiple versions of a web page can be cached separately. The first page, QueryStringSender.aspx, isn t cached. It provides three buttons, as shown in Figure 24-3.

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