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n 5, you looked at two of the most important objects in ADO.NET: the DataReader and the DataSet. You saw how the DataReader is a transient object and provides forward-only, read-only access to the results of any query you send to the data source. In contrast, the DataSet is a read-write, random-access representation of any data source that stays in memory even when the connection to the data source closes. You learned how they both can be populated with data from a data source, and how you can pull that data into something more useful for your Web site, such as a business object. In this and the next chapter, you ll continue your work with these two objects, as well as the SqlDataSource, and discover the various ways of retrieving and displaying read-only data on a page. You ll also see that the trade-off between the speed of the DataReader and the availability of the DataSet often makes a difference in the way you build even simple pages. In this chapter, you ll learn the following: The three types of data-binding: inline binding, list binding, and table binding The differences between binding a DataReader or DataSet in code and binding using the SqlDataSource How to perform inline binding to both a DataReader and DataSet An alternative to inline binding that returns the same results How to perform list binding to a DataReader, DataSet, and SqlDataSource How to perform listing binding with Web list controls that allow multiple selections

just to make your control functional. In this scenario, you can use a control state feature that ASP.NET provides. The basic idea is that you override the SaveControlState() method to store the information you need and the LoadControlState() method to retrieve it. The information is still placed in the page s view state, but it won t be removed even if EnableViewState is set to False. Microsoft recommends you use this feature with caution and only when it is absolutely required. To learn more about this feature, consult the documentation for the SaveControlState() and LoadControlState() methods in the MSDN Help.

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The drawback with output caching is that if the information in the database changes in the meantime, your page will display outdated information For controls whose data is susceptible to frequent updates, the duration of the cache should be shorter Also, enabling output caching, although it saves server-processing power, consumes server memory, and should be used with caution This is especially true when storing multiple versions of the page or user control being cached You can enable output page caching for a Web Form or Web User Control using the OutputCache page directive, which has a number of optional parameters: <%@ OutputCache Duration="#ofseconds" Location="Any | Client | Downstream | Server | None" Shared="True | False" VaryByControl="controlname" VaryByCustom="browser | customstring" VaryByHeader="headers" VaryByParam="parametername" %> Duration: Specifies the number of seconds the page is stored in cache.

Any properties you add for the custom control automatically appear in the Properties window under the Misc heading. You can further customize the design-time behavior of your control by using various attributes from the System.ComponentModel namespace:

In 1, I described how a data-aware page is basically a static template into which data is added dynamically from a data source. This plugging in of data to a page is more commonly known as data binding. You saw data binding in action in 3 with the SqlDataSource, and then in 4, when you actually wrote code to return the results that you wanted from the database.

For example, the property defined next will always appear in the Layout category of the Properties window. It indicates this to Visual Studio through the System.ComponentModel.Category attribute.

A page is stored in cache the first time it s generated, which happens the first time a visitor asks for it All the subsequent requests for that page, during the period mentioned by Duration, are served directly from cache instead of being processed again After the cache duration expires, the page is removed from the cache Location: Specifies the place the actual data for the cache is stored The default value (Any) caches the page on the client browser, on the web server, or on any proxy servers supporting HTTP 11 caching located between the client and the server Shared: Applies only to user controls, and specifies whether the output of the user control should be cached once for all the pages that include the control, or if multiple versions of the control should be cached for each page that contains it.

Note that attributes are always enclosed in angled brackets and must appear on the same line as the code element they refer to (in this case, the property procedure declaration) or be separated from it using the underscore continuation character. (You may remember that .NET attributes were also used when programming web services. In that case, the attributes were named WebMethod and WebService.) You can specify more than one attribute at a time, as long as you separate them using commas. The example here includes a Category attribute and a Description attribute. Figure 25-16 shows the result in the Properties window.

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