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A section handler object might be used in any configuration file, including a web.config file. For this reason, when implementing the IConfigurationSectionHandler interface, you should check the value in the parent argument and act accordingly. We'll look at an example of this in the section "Implementing the DataSet Section Handler," on page 653. The configContext argument is non-null only if you use the section handler within a web.config file in an ASP.NET application. In this case, the argument evaluates to an object of type HttpConfigurationContext, whose only significant member is a property named VirtualPath. The VirtualPath property contains the virtual path to web.config with respect to the ongoing Web request. In this way, you can determine the level of configuration nesting at which your handler is called to operate. Finally, the section argument is the XML DOM node object rooted at the section to be handled. The argument is an XML DOM subtree that represents the data to be processed. Note To better understand the rather symbolic role played by the IgnoreSectionHandler section handler class, consider what the implementation of its Create method looks like: object Create(object parent, object context, XmlNode section) { return null; } No information is returned, but neither is an exception thrown. Customizing Attribute Names Configuration settings are stored using predefined attribute names: key for the setting's name, and value for the actual contents. Such names are hard-coded as protected members in the NameValueSectionHandler and DictionarySectionHandler classes. Their associated properties are named KeyAttributeName and ValueAttributeName, respectively. To customize those names, you must derive a new class, override the properties, and use the new class as your section handler.

You need to configure your TeamCity project (see figure 4.16). Give the build configuration a meaningful name and description. Look at the build-number format (the example takes the revision number and assigns it to the build). The build process doesn t leave any artifacts now, so leave the artifacts paths empty (you ll learn about artifacts in the next chapter). Next, you can decide when to fail a build based on the build exit code, test output, build runner errors, exceeding the maximum build time, lack of system resources, or an unexpected crash. You can decide whether TeamCity will try to detect hanging builds (builds that are running but aren t doing anything). By enabling the status widget, you give external sites the ability to retrieve the build status. The last thing you can decide is the maximum number of simultaneous builds of this type to run. Notice the Configuration Steps at the right in figure 4.16; they help you keep track of everything you need to do.

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User controls and custom controls will be critical in the acceptance of ASP.NET by the bulk of Visual Basic programmers. These programmers have long relied on the wide range of components available to allow them to focus on the business-specific code.

The following code demonstrates a class that inherits from NameValueSectionHandler and simply renames the attributes to be used for the settings. Instead of the default names key and value, SettingKey and SettingValue are used. public class CustomNameValueSectionHandler: NameValueSectionHandler { public CustomNameValueSectionHandler(): base() { } protected override string KeyAttributeName { get{return "SettingKey";} } protected override string ValueAttributeName { get{return "SettingValue";} } } Note that the KeyAttributeName and ValueAttributeName properties are read-only, protected, and virtual. You must retain the same modifier and override the properties in a new class. There is no need to make the properties read/write. The preceding class is defined in the sample application AppSettings_CS available in this book's sample files and enables you to access the configuration file shown here: <configuration> <configSections> <sectionGroup name="AppName"> <section name="CustomSection" type="AppSettings_CS.CustomNameValueSectionHandler, AppSettings_CS" /> </sectionGroup> </configSections> <AppName> <CustomSection> <add SettingKey="Property" SettingValue="My value" /> </CustomSection> </AppName> </configuration> The beauty of these section handlers is that they encapsulate all the logic necessary to access settings in the configuration file. The application is not affected by the actual layout of the setting. As a result, reading the preceding value requires the same highlevel code, regardless of the attribute names you use, as shown here: 521

Figure 4.16 General project settings. Pay close attention to the build-number formatter and the fail conditions. Builds are formatted with the revision number. In this case, you decide to fail if the build exceeds 10 minutes.

Between user controls, most often produced within the enterprise, and custom controls, often created by centralized component librarians or third parties, components will be present on the vast majority of ASP.NET pages. I hope this introduction to controls will open your mind to what can be done with controls. Although VBX controls were popular in Visual Basic, ActiveX controls, especially after it was possible to build them using Visual Basic, continue to be huge. ASP.NET, in a version 1.0 product, provides what I think you ll agree is an easy control-creation tool. In future chapters, I ll cover several other aspects of user controls and custom controls. In 7, you ll find out how to decide when to use the client for processing and when the server is best, as well as the many times when using both is appropriate. In s 8 and 9, we ll examine database and XML access. There are many built-in controls that use data, and many custom controls that can be built to use data more efficiently.

NameValueCollection coll; coll = ConfigurationSettings.GetConfig("AppName/CustomSection"); MessageBox.Show(coll["Property"]);

Monitor the ASP.NET newsgroups for any time at all, and you ll likely see a frustrated message from a programmer new to ASP.NET in particular and probably new to Web development in general. The message will be something like this: If C# [or Visual Basic .NET your pick] is so powerful, how come I can t get my ASP.NET application to put up a simple message box ! Experienced classic ASP developers will perhaps chuckle a bit at this question, but it s a real issue for many developers new to Web development. Why can t you display a simple message box like you re used to doing in Visual Basic Much like in the Wizard of Oz, when Dorothy discovered that she wasn t in Kansas anymore, the answer here is that you re not a client-side programmer anymore. ASP.NET is a server-based technology. Using ASP.NET gives you access to the newest and greatest in many areas of server programming, but if you want to use ASP.NET to display a message box, you re out of luck. However, there is a way to present message boxes and other similar close user interactions. The answer is client-side scripting. Note By the way, the JavaScript command to present the user with a message box is the alert function. This chapter introduces clientside scripting, but it is not a tutorial or a reference on JavaScript. Many good books on JavaScript are available, including JavaScript: The Definitive Guide by David Flanagan (O Reilly, 1996).

When you ve configured the project s build options, you must configure the connection to the version control system (VCS) in other words, your source code repository (see figure 4.17). The source root configuration varies depending on the source control system you re using. Because you re using SVN, you must provide at least the SVN URL, username, and password. You have to decide whether to use the default configuration directory (you don t have to change this if you aren t doing anything extraordinary). You can choose to pull the source with all externals (you learned about this in chapter 2). You can leave all the rest of the settings at their defaults. The newly created source control root will be added to the project configuration.

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