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In this chapter, you looked in detail at the DataReader and DataSet objects. These are the two objects most commonly used as the receptacle for query results by data-driven pages. You learned that the DataReader is a read-only, forward-only, data-provider-specific window on the results of the query sent by a page, and that you can iterate through those results a row at a time using the DataReader s Read() method. Individual pieces of information can be identified in the current row in a DataReader by name and by index and can be vetted before being used with the DataReader s HasRows and IsDBNull properties. In contrast, you saw that the DataSet is data-provider-independent. It s a container for a group of objects that can describe with some accuracy the table structure and relationships in a database, and because it s all in memory, the query results stored in a DataSet are read-write and can be accessed in any order. You can either build a complete data structure in code from scratch or Fill() it using a DataAdapter object. In the next chapter, you ll begin your exploration of data binding, beginning with inline and list binding.

The code is essentially the same, although it now uses a constructor to initialize the RepeatTimes and Text values. You must take extra care to make sure the view state object is converted to the correct data type. Performing this conversion manually ensures that you won t end up with difficult-to-find bugs or quirks. Note that although the code looks the same as the code used to store a variable in a Page object s view state, the collections are different. This means the web page programmer won t be able to access the control s view state directly. You ll find that if you set the EnableViewState property to False, changes aren t remembered, but no error occurs. When view state is disabled, ASP.NET still allows you to write items to view state, but they won t persist across postbacks. With the ConfigurableRepeater, you ll see the same behavior you saw without view state at the start of each postback, the property values will be reset to their defaults. Although this sounds inconvenient, it s actually the behavior you want. For example, the web page developer may decide to set certain properties at the beginning of every postback, in which case there s no point in maintaining them in view state. You should ensure that your control should still work when view state is switched off, even if changes won t persist.

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Output page caching is an ASPNET feature that increases the performance of your Web Application by caching the HTML content generated from dynamic pages or controls In other words, a page or user control that has output caching enabled is only executed the first time it is requested On subsequent requests, the page or control is served directly from the cache, instead of being executed again This can have an important effect on performance for BalloonShop, because most controls access the database to populate themselves with information With output caching enabled, the controls only read the database the first time they are accessed You can set the interval of time at which the cache expires, so the controls have the chance to execute again, and refresh them with current information.

Note In some advanced control scenarios, you may need to retain a bare minimum of state information

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