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Most web applications deal extensively with user-specific data. For example, if you re building an e-commerce site, you might need to store and retrieve the current user s address, viewing preferences, shopping basket, and so on. ASP.NET 1.x allowed you to cache this information for a short amount of time in session state, but it was still up to you to write this information to a database if you needed it for a longer period of time and then retrieve it later. ASP .NET 2.0 addresses this limitation with personalization, an API for dealing with user-specific information that s stored in a database. The idea is that ASP.NET creates a profile object where you can access the user-specific information at any time. Behind the scenes, ASP.NET takes care of the tedious work of retrieving the profile data when it s needed and saving the profile data when it changes. Most serious developers will quickly realize that the default implementation of personalization is a one-size-fits-all solution that probably won t suit their needs. For example, what if you need to use existing database tables, store encrypted information, or customize how large amounts of data are cached to improve performance Interestingly, you can customize personalization to suit your needs by building your own personalization provider. This allows you to use the convenient personalization features but still control the low-level details. Of course, the drawback is that you re still responsible for some of the heavy lifting (no more 70 percent code reduction), but you gain the flexibility and consistency of the profile model. You ll learn about personalization in 24.

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Tip You can also pass to Html.ValidationSummary() a parameter called message. This string will be rendered immediately above the bulleted list if there is at least one registered error. For example, you could display the heading Please amend your submission, and then resubmit it.

Many of the features in ASP.NET 2.0 work through an abstraction called the provider model. The beauty of Tip the provider model is that you can use the simple providers to build your page code. If your requirements change, you don t need to change a single page instead, you simply need to create a custom provider. The provider model is useful enough that a similar organization pattern was used for similar handcrafted solutions in the first edition of this book, before ASP.NET 2.0 appeared.

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This is a normal managed object context that holds the managed objects. Saving the context saves all the objects in it. You typically use your application s managed object context for this parameter.

There are two things to notice about this screen: Where did the The AppointmentDate field is required message come from That s not in my controller! Yes, when the framework prepares a ModelMetadata instance to describe a property that can t hold null (such as DateTime, a value type), it automatically sets the metadata s IsRequired flag to true. Then, the builtin default validation provider enforces this rule. If you don t like this, change the property type to DateTime , or explicitly add your own required field validator for that property giving an alternative error message, as discussed shortly.

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