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If you edit control names in one piece using another tool (such as a text editor), you ll break the link, and your code won t compile Incidentally, you ll notice that control variables are always declared with the protected accessibility keyword That s because of the way ASPNET uses inheritance in the web-page model The following three layers are at work: First, the Page class from the NET class library defines the basic functionality that allows a web page to host other controls, render itself to HTML, and provide access to the traditional ASP objects such as Request, Response, and Session Second, your code-behind class (for example, TestFormCodeBehind) inherits from the Page class to acquire the basic set of ASPNET web-page functionality Finally, the aspx page (for example, HelloWorldPageaspx) inherits the code from the custom page class you created.

ADO.NET 2.0 provides support for a few features that are limited to SQL Server 2005. These features include the following: MARS (multiple active result sets): This allows you to have more than one query on the go at the same time. For example, you could query a list of customers and then query a list of orders without closing the first query. This technique is occasionally useful, but it s better if you can avoid the extra overhead. User-defined data types: Using .NET code, you can define a custom class and then store instances of that class directly in a column of the database. This saves you the work of examining several fields in a row and then manually creating a corresponding data object to use in your application. Managed stored procedures: SQL Server 2005 can host the CLR, which gives you the ability to write stored procedures in the database using pure .NET code. SQL notifications: Notifications allow your code to respond when specific changes are made in a database. In ASP.NET, this feature is most commonly used to invalidate a cached data object when one or more records are updated. This is the only SQL Server 2005 feature that s also supported in SQL Server 7 and SQL Server 2000, albeit through a different mechanism. Snapshot transaction isolation: This is a new transaction level that allows you to improve concurrency. It allows transactions to see a slightly older version of data while it s being updated by another transaction.

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You may remember serializable classes from earlier in this book Classes need to be serializable in order to be stored in the view state for a page or put into an out-of-process session state store In those cases, you let NET serialize the object for you automatically However, you can also manually serialize a serializable object and store it in a file or another data source of your choosing (such as a binary field in a database) To convert a serializable object into a stream of bytes, you need to use a class that implements the IFormatter interface The NET Framework includes two such classes: BinaryFormatter, which serializes an object to a compact binary representation, and SoapFormatter, which uses the SOAP XML format and results in a longer text-based message The BinaryFormatter class is found in the SystemRuntimeSerializationFormattersBinary namespace, and SoapFormatter is found in the System.

This allows it to combine the user interface with the code that supports it Protected variables act like private variables with a key difference they are accessible to derived classes In other words, using protected variables in your code-behind class ensures that the variables are accessible in the derived page class This allows ASP NET to connect your control variables to your control tags at runtime..

All themes are application-specific To use a theme in a web application, you need to create a folder that defines it You need to place this folder in a folder named App_Theme, which must be inside the top-level directory for your web application In other words, a web application named SuperCommerce might have a FunkyTheme theme in the SuperCommerce\App_Theme\FunkyTheme folder An application can contain definitions for multiple themes, as long as each theme is in a separate folder Only one theme can be active on a given page at a time In the Applying Themes Dynamically section, you ll discover how you can dynamically change the active theme when your page is processing To actually make your theme accomplish something, you need to create at least one skin file in the theme folder A skin file is a text file with the skin extension ASP .

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