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Two buttons aren t standard in Excel: the Export To Excel button and the Commands and Options button. The Export To Excel button, familiar to SharePoint users, creates the Excel worksheet in a user-specified folder so users can manipulate a copy of the data as much as they wish without changing the original data in the web page. The Commands and Options button opens the Commands and Options dialog box, which includes additional user tools (see Figure 6-8). Make sure your users know about this dialog box, because it s filled with power: the power to change the format of a worksheet, work with formulas in the worksheet, find worksheet data, and change worksheet and workbook options.

You can also view applied styles at a glance by activating the Styles area. By default, Word hides the Styles area. But to activate it, click Tools Options and open the View tab,

In this context, XSL files were simply extensible and user-definable tools to render an XML markup in HTML for display purposes The growing complexity of style sheets, as well as the advent of XML schemas, changed the perspective of XSL and led to XSL Transformations (XSLT)..

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The <appSettings> section is one of many predefined configuration sections provided by the .NET Framework. Programmers can also create their own sections. To create a new section, you need to accomplish two basic tasks: declare the section in the <configSections> block, and fill the section with custom data. One of the key bits of information you need to specify while declaring a new section is the name of the section handler class. The section handler class can be one of the predefined classes provided by the .NET Framework or a class that you write from 515

Figure 6-8. You use the Commands and Options dialog box to format and modify the data displayed in the Spreadsheet component. The Spreadsheet component doesn t support all the features and functionality of Excel. Table 6-1 describes worksheet properties and features that the component doesn t support.

scratch or inherit from an existing class. The section handler object is responsible for reading and parsing the actual contents of the setting. Declaring a New Section The<configSections> node contains the declarations of all the sections in the various configuration files. The predefined sections are declared in the machine.config file that the .NET Framework installs. Custom sections must be registered by the application that plans to use them. The application's configuration file is a good place for inserting this information. The <configSections> node can accept up to four child nodes: <section>, <sectionGroup>, <remove>, and <clear>. The <remove> element removes a previously defined section, or a section group, from the <configSections> block. The <clear> element clears all previously defined sections and section groups. Note The <remove> and <clear> elements don't affect the actual data stored in the configuration file. Removing a section doesn't erase the related data from the file, but the data becomes unreachable because of the missing section declaration.

Comments Conditional formatting Graphics Group and outline symbols Indented text Links to other worksheets, workbooks, and web queries Outlined ranges Precedent and dependent arrows Print settings, including rows to repeat, columns to repeat, and print area Rotated text Shared workbook information Validation rules and error alerts

A new section is registered using the <section> element. As mentioned, the name attribute of this element specifies the name of the section and the type attribute specifies the name of the section handler class. The name of the configuration section class should contain full assembly information, including version, culture, and public key token, if any. All the predefined handlers are defined in the same assembly and therefore share the same information, as in the following example: System, Version=1.0.3300.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 Note When you create a custom assembly with no strong name (a strong name is necessary if you want to put the assembly in the global assembly cache), the version number is defined in the assemblyinfo file that Microsoft Visual Studio .NET automatically adds to the project. The culture is neutral, and the public key token is null. Here's an example: AppSettings_CS, Version=1.0.9.0, Culture=neutral, PublicKeyToken=null

as shown in Figure 8-14. On the bottom of the tab, use the controls in the box labeled Style area width to specify the width for the Styles area. Click OK.

The custom section follows the <configSections> block and contains the actual configuration settings. The following code creates a new section named userPreferences that accepts name/value pairs: <configuration> <configSections> <section name="userPreferences" type="System.Configuration.NameValueFileSectionHandler, System, Version=1.0.3300.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" /> </configSections> <userPreferences> <add key="ReleaseDate" value="10-9-02" /> 516

Discarded. Not supported. Cells display as formatted when the page is published. Not displayed. Not supported. Not supported. Displays without indents. Discarded. Cells display with values when the page is published. Collapsed rows are hidden. Discarded. Discarded.

</userPreferences> </configuration> Sections can be grouped under a <sectionGroup> element. Declaring a section group creates a namespace and ensures that no naming conflicts arise with other configuration sections defined by someone else. Section groups can also be nested within each other. The following code snippet declares the userPreferences section nested in the AppName group: <sectionGroup name="AppName"> <section name="userPreferences" type="System.Configuration.NameValueSectionHandler, system, Version=1.0.3300.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" /> </sectionGroup> A node with the group name must also wrap the settings subtree, as shown here: <AppName> <userPreferences> <add key="ReleaseDate" value="10-9-02" /> </userPreferences> </AppName> To read the settings of a custom section, you use the GetConfig method, passing the fully qualified name of the section to retrieve. For example, the following code returns the settings in the <userPreferences> section: NameValueCollection settings; settings ConfigurationSettings.GetConfig("AppName/userPreferences"); MessageBox.Show(setting["ReleaseDate"]); Note A new section, or section group, that is defined in the machine.config file is visible to all applications. This setting can be changed using the allowDefinition attribute for ASP.NET applications only. In contrast, sections defined in the application configuration file are visible only to the local application. =

Types of Section Handlers A section handler is a .NET Framework class that implements the IConfigurationSectionHandler interface. It interprets and processes the configuration settings stored in a configuration section and returns a configuration object based on the configuration settings. The returned object is accessed by the GetConfig method. The data type returned by the GetConfig method depends on the section handler defined for the particular section. The .NET Framework provides a few predefined section handlers, listed in Table 15-2. All of these section handlers belong to the System.Configuration namespace and are implemented in the System assembly. 517

Because data values persist during a browser session, another good use of the Spreadsheet component is to create a small application that collects values from a user and performs a few calculations.

Table 15-2: Predefined Section Handlers Class Description DictionarySectionHandler Reads name/value pairs and groups them in a hash table object The SystemConfiguration classes ignore IgnoreSectionHandler the sections marked with this handler because their contents will be processed by other components This handler is an alternative to using and declaring custom handlers Reads name/value pairs from a file NameValueFileSectionHandler referenced in the <appSettings> section and groups them in a NameValueCollection object Reads name/value pairs and groups them NameValueSectionHandler in a NameValueCollection object SingleTagSectionHandler Reads settings from attributes stored in a single XML node The data is returned as a hash table In the NET Framework, the classes in the SystemConfiguration namespace are responsible for parsing the contents of the configuration files These classes are designed to process the entire contents of the configuration files.

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