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1. You request a page without any query string parameter and receive page copy A. 2. You request the page with the parameter ProductID=1. You receive page copy B. 3. Another user requests the page with the parameter ProductID=2. That user receives copy C. 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.

Although the list of objectives might look intimidating at first, it will be easy to implement. We have already covered most of the theory in the previous chapters, but you ll still learn a few new bits of information in this chapter.

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Figure 6-8. You can build a simple check box by list binding. Apple, Creative, iRiver, and so on are displayed in the browser, and the choice registers in the page as 1, 2, 3, and so on. When you re list binding to a Web control, you need to establish a data source containing two columns per row: one for the text to be displayed and the other to identify the choice the user has made. Here s an example: SELECT ManufacturerID, ManufacturerName FROM Manufacturer With the data source established (either by setting the DataSource or DataSourceID property, in code or in the HTML markup of the Web control), you need to tell the Web control which column does what. You do this by setting the DataTextField and DataValueField properties as appropriate. You can do this either in HTML: <asp:RadioButtonList id="RadioButtonList1" runat="server" DataTextField="ManufacturerName" DataValueField="ManufacturerID" /> or in code: RadioButtonList1.DataTextField = "ManufacturerName"; RadioButtonList1.DataValueField = "ManufacturerID";

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

a 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.

The first step toward creating the catalog administration page is to create a simple login mechanism for administrators. This mechanism will be extended in 12, where you ll add customer accounts. The user interface bit of the login functionality consists of a control named UserInfo that allows the administrator to authenticate himself or herself (see Figure 8-1).

The Web list controls have the following two relevant properties: DataMember: This property is for use with a DataSet, as you ll see in the example in the upcoming Try It Out: Using Lookup Lists and Events with a DataSet section. As a DataSet can contain multiple tables, this property is used to specify which table to use from the DataSet. DataTextFormatString: This property lets you set the format for the text displayed in the list and comes in handy when you re dealing with currency, dates, and numbers. See http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.listcontrol. datatextformatstring.aspx for examples. Once the Web list control has been configured correctly, it s time to actually perform the data binding. Using a SqlDataSource, the data binding takes place automatically. If you re using a DataSet or a DataReader as the data source, or you need the data binding to occur at a specific place in code, then all that s left to do is call DataBind() on the Web list control.

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:

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:

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