c# code 39 US E OF XML IN THE .N ET FRA MEWORK in C#.NET

Making Code 39 Full ASCII in C#.NET US E OF XML IN THE .N ET FRA MEWORK

CHAPTER 11 US E OF XML IN THE .N ET FRA MEWORK
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Note These are the same files that you used in 6. If you wish, you can add them to your website
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instead of re-creating them.
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Now drag and drop an XML control onto the default web form. Set its DocumentSource property to Employees.xml and its TransformSource property to Employees.xsl. The former property points to the XML file that is to be transformed, whereas the latter property points to the XSLT style sheet that is to be applied to the DocumentSource. Now run the web form and you should see something similar to Figure 11-20.
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Figure 11-20. XML data transformed to HTML by using the XML control
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Using the .NET Framework Configuration System
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The .NET Framework s configuration system is based purely on XML. When you install the .NET Framework on a machine, an XML file named Machine.config is installed in the installation folder. The Machine.config file is the master configuration file and contains configuration settings that are applied to all .NET applications running on that machine. Though this file is in XML format and can be edited directly, you should do so with caution. Any change made to this file is going to affect all the applications running on that machine. Figure 11-21 shows a view of Machine.config.
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C HA PTER 11 USE O F XML I N T HE .NET F RAME WO RK
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Figure 11-21. Machine.config To override settings specified in the Machine.config file, you need to create application configuration files. Application configuration files are also XML files containing special XML markup. For Windows-based applications, the application configuration file is of the form <exe_name>.exe.config, where exe_name is the name of the application executable. For web applications and services, the application configuration filename must be web.config. In the following sections, you are going to learn more about the web.config file and the XML vocabulary used therein.
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Structure of the web.config File
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Listing 11-19 shows the general structural outline of a web.config file. Listing 11-19. Structural Outline of web.config <configuration> <appSettings /> <connectionStrings /> <system.web /> </configuration>
CHAPTER 11 US E OF XML IN THE .N ET FRA MEWORK
As you can see, the root node of the web.config file is <configuration>, and there are three main subsections: The <appSettings> section is used to specify application configuration settings. The <connectionStrings> section is used to store one or more database connection strings. The <system.web> section contains all the settings applicable to web applications. All of these sections are optional. However, in most real-world cases you will have at least the <system.web> section.
Note The web.config file contains many configuration sections. It isn t possible to cover every section
here. I am going to discuss some commonly used sections only.
Inheritance and web.config
The web.config file exhibits what is often referred to as inheritance behavior. In a single web application, there can be one or more web.config files in different folders. The settings of one web.config file are applied to the folder in which it resides and all the subfolders. However, if the subfolders contain a web.config of their own, the settings specified in that web.config take precedence.
Common Configuration Tasks
Now that we have a basic understanding of how web.config works, let s see how to perform some common configuration tasks. We are going to cover the following tasks in particular: How to store and retrieve application configuration settings How to store and retrieve your database connection strings How to work with membership, roles, and profile features How to provide custom error pages in your website
Storing and Retrieving Application Configuration Settings
Avoiding hard-coding values is a mandatory requirement in many real-world applications. Earlier in this chapter, we developed a Contact Us web form that sends messages from users to a specified email address. In that example, we hard-coded an email address in the code-behind file. What if the email address changes after deployment Obviously, you need to change the source code to match the new email address and redeploy the application. This is not a recommended practice for real-world applications. Wouldn t it be nice if we could isolate the email address from the application, store it in an external location, and retrieve it inside your code In VB6 or Visual C++, developers achieved this by using .INI files or the registry. In .NET you have a nice alternative: the application configuration section of configuration files.
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