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On the left side of the screen is the Toolbox, which enables you to drag and drop controls onto your web application. Controls can be either ASP.NET server controls, which wrap basic HTML controls but provide for a greatly enhanced programming interface; or standard controls, which represent basic HTML controls, such as buttons, input text controls, and lists, but without the enhanced programming interface (their programming interface mimics the basic control itself). Both types of controls are rendered into raw HTML when the page is compiled, which occurs either beforehand if you like, or when the page is first accessed on the server.

We now close the connection to the page and discard held resources:

saved as Employees.htm. If the check box is checked, the Employees.htm file is displayed in the browser. The code that does the job of transforming the data is shown in Listing 13-26. Listing 13-26. Transforming an XML Tree Using Functional Construction private void button1_Click(object sender, EventArgs e) { XElement root = XElement.Load(Application.StartupPath + @"\employees.xml"); XElement html = new XElement("html", new XElement("body", new XElement("table", new XAttribute("border",1), new XElement("th", "Employee ID"), new XElement("th", "First Name"), new XElement("th", "LastName"), new XElement("th", "Home Phone"), new XElement("th", "Notes"), from item in root.Descendants("employee") select new XElement("tr", new XElement("td", item.Attribute("employeeid").Value), new XElement("td", item.Element("firstname").Value), new XElement("td", item.Element("lastname").Value), new XElement("td", item.Element("homephone").Value), new XElement("td", item.Element("notes").Value))))); html.Save(Application.StartupPath + @"\employees.htm"); if (checkBox1.Checked) { Process.Start(Application.StartupPath + @"\employees.htm"); } else { MessageBox.Show("Output saved as " + Application.StartupPath + @"\employees.htm"); } } The code loads the Employees.xml file into an instance of the XElement class. It then creates another XElement named html using functional construction. Notice how the XML data is selected from descendent <employee> elements into the new XElement objects. Effectively, in just one statement, we are able to transform the source XML tree into HTML.

Figure 2-4 shows the Toolbox with each group of controls hidden in collapsed tree control nodes commonly referred to as tabs (even though this isn t a Tab control!).

reader.close(); connection.disconnect(); connection = null;

Next we process the buffer to determine what links are permitted:

The new XElement formed after transformation is saved to the disk as the Employees.htm file. If the check box is checked, the code opens the Employees.htm file in the browser; otherwise, a success message box is displayed. Figure 13-19 shows the Employees.htm file generated as a result of a sample run of the application.

The Toolbox gathers all your controls into logical groupings, accessed by tabs. Following is the default set of tabs: Standard: Contains the standard suite of ASP.NET server controls Data: Contains the suite of ASP .NET server controls that can be bound to data Validation: Contains the suite of ASP.NET server controls that can be used to validate user input Navigation: Contains the suite of ASP.NET server controls that can be used to build navigation on a web site Login: Contains the ASP .NET server controls for login and user management WebParts: Contains server controls used to build SharePoint WebParts applications HTML: Contains standard, generic HTML controls General: Empty by default, but can be used as a scratch pad for your favorite controls You aren t limited to this group of tabs or the controls that they contain. You can right-click the Toolbox to add or remove tabs and to add or remove controls from a tab.

processRobotBuffer(buffer,link); } } catch( IOException e ) {

XAttributes and then create the required nesting. However, functional construction makes your code tidy and easy to read. If your XML data is generated as a result of some complex processing or logic, then you may need to create various elements and attributes as stand-alone entities and then associate them with each other. This process is very similar to the approach taken by XML DOM.

s Note Did you know that you can put code snippets in the Toolbox, too Simply highlight them, and then

Good. There is no robots.txt file, and we re allowed to view the site. To ensure that the connection is always closed correctly, we use the following:

} finally { if( connection != null ) { connection.disconnect(); } } }

drag and drop them onto the Toolbox!