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Finally, a delete operation is the simplest data operation of all. You simply need to call the DeleteObject() method of the appropriate collection, followed by SaveChanges(). The following code retrieves the currently selected product object and removes it from the database using this approach: protected void cmdDelete_Click(object sender, EventArgs e) { // Check if a row is selected. if (gridProducts.SelectedIndex != -1) { // Use a LINQ expression to find the selected product. int selectedProductID = (int)gridProducts.SelectedDataKey.Value; var matches = from p in entities.Products where p.ProductID == selectedProductID select p; // Execute the query and return the entity object. Product product = matches.Single(); // Delete the record from the database. entities.Products.DeleteObject(product); entities.SaveChanges(); // Clear the selection (which may now be pointing to a different row.) gridProducts.SelectedIndex = -1; } } The Entity Framework uses a fairly sophisticated change tracking system to make these operations work. When you call SaveChanges(), the context object attempts to commit all of the changes in the data that it s tracking, including updates, deletions, and insertions. If you have related records, the Entity Framework will apply the changes in an order that makes sense (for example, it won t attempt to insert a child record before inserting a linked parent). This ability is more interesting if you use the Entity Framework in a rich desktop application, where you might keep the entity objects in memory for a long period of time, and periodically commit a batch of updates. But in a web application, where your page lives for only a few seconds (or less), you ll almost always create a new context object, perform all your database operations immediately, and then discard it.

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 includes a feature called cache profiles that makes it easy to apply the same caching settings to a group of pages. With cache profiles, you define a group of caching settings in the 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. <configuration> <system.web> <caching> <outputCacheSettings> <outputCacheProfiles> <add name="ProductItemCacheProfile" duration="60" /> </outputCacheProfiles> </outputCacheSettings> </caching> ... </system.web> </configuration> You can now use this profile in a page through the CacheProfile attribute: <%@ OutputCache CacheProfile="ProductItemCacheProfile" VaryByParam="None" %> Interestingly, if you want to apply other caching details, such as the VaryByParam behavior, you can set it either as an attribute in the OutputCache directive or as an attribute of the <add> tag for the profile. Just make sure you start with a lowercase letter if you use the <add> tag, because the property names are camel case, as are all configuration settings, and case is important in XML.

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Note When you call SaveChanges(), all the changes are performed as part of a single transaction. If an error

Data caching is the most flexible type of caching, but it also forces you to take specific additional steps in your code to implement it. The basic principle of data caching is that you add items that are expensive to create to a built-in collection object called Cache. Cache is a property of the Page class, and it returns an instance of the System.Web.Caching.Cache class. This object works much like the Application object you saw in 7. It s globally available to all requests from all clients in the application. But it has three key differences:

occurs, the entire process is rolled back, but your objects remain in their current state, with any new and edited information. That means you can programmatically resolve the problem and call SaveChanges() again.

Sometimes it is advantageous to have a unique code for each instance of a class. For this purpose, SPL provides the spl_object_hash() function. Listing 9-16 shows its invocation. Listing 9-16. Invoking spl_object_hash class a {} $instance = new a(); echo spl_object_hash($instance); This code generates the following output:

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