TAILIEUCHUNG - Professional ASP.NET 3.5 in C# and Visual Basic Part 146

Professional in C# and Visual Basic Part 146. Building on the revolutionary release, adds several key new developer features including AJAX, LINQ, and a new CSS designer in Visual Web Developer 2008. The dramatic reduction in code that developers realized from the more than 50 new server controls in now allows developers the time to make their applications more interactive with AJAX, to work with data in their preferred language with LINQ, and to build visually attractive and consistent standards-based sites with CSS. . | Chapter 31 Configuration then that particular setting overrides the default setting inherited from the or the root file. The files in the subdirectories or subfolders can override these settings or inherit the settings such as the 10-minute session timeout . The configuration settings for virtual directories are independent of the physical directory structure. Unless the manner in which the virtual directories are organized is exclusively specified configuration problems can result. Note that these inheritance override rules can be blocked in most cases by using the allowOverride false mechanism shown in Listing 31-3. Detecting Configuration File Changes automatically detects when configuration files such as or are changed. This logic is implemented based on listening for file-change notification events provided by the operating system. When an application is started the configuration settings are read and stored in the cache. A file dependency is then placed on the entry within the cache in the and or configuration file. When the configuration file update is detected in the creates a new application domain to service new requests. The old application domain is destroyed as soon as it completes servicing all its outstanding requests. Configuration File Format The main difference between and is the filename. Other than that their schemas are the same. Configuration files are divided into multiple groups. The root-level XML element in a configuration file is named configuration . This pseudo file has a section to control as shown in Listing 31-6. Listing 31-6 A pseudo file xml version encoding UTF-8 configuration configSections section name sectionSettings type Class sectionGroup name sectionGroup section name sectionSettings type Class sectionGroup configSections .

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