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ASP.NET uses XML in several places. Some of the main areas where XML is used extensively are as follows: Server control markup XML data source control Navigational controls such as TreeView, Menu, and SiteMap XML control Website configuration You will learn about all these features in the following sections.
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As mentioned previously, ASP.NET web forms consist of HTML and server control markup. The server control markup is actually a special vocabulary of XML. Each server control has a predefined tag name, tag prefix, and attributes. Some server controls are empty elements (they do not contain any child elements), whereas others can contain markup or text.
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CHAPTER 11 US E OF XML IN THE .N ET FRA MEWORK
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To better understand server controls, you will develop an ASP.NET website with one web form. The web form represents a typical Contact Us page. The page will be used by end users to contact you with any questions, feedback, or comments about your website. Creating a Website To create a new website by using Visual Studio, you need to choose the File New Web Site option. This option opens the New Web Site dialog box shown in Figure 11-4.
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Figure 11-4. Creating a new website The ASP.NET Web Site template allows you to create a website. The Location drop-down list indicates the target location where the website will be created. Possible locations are File System, IIS Virtual Root (HTTP), and FTP Folder (FTP). In our example, we will choose File System. The path specified after the Location drop-down is the target folder where the website will be created. Make sure to select Visual C# as the language. Click the OK button to create the website. Visual Studio will create the website with a single web form named Default.aspx. Designing the Web Form The next task is to design the Contact Us web form. To do so, choose Layout Insert Table from the menu and insert a table with 11 rows and 2 columns in the default web form. Now you need to drag and drop various controls and arrange them in the cells of this table, as detailed in the following steps. Figure 11-5 shows Default.aspx after designing the web form.
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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 11-5. Designing a web form The web form consists of many server controls such as Label, TextBox, DropDownList, RadioButtonList, Button, RequiredFieldValidator, RegularExpressionValidator, and ValidationSummary. To begin designing the web form, use the following steps: 1. Drag and drop a Label control to the first row of the table. Set its Text property to Contact Us. Set its Font property to your choice. Also, drag and drop a Horizontal Rule HTML control below the Contact Us label. 2. Drag and drop a ValidationSummary control in the second row. The ValidationSummary control is available in the Validation node of the toolbox and is used to display a consolidated list of validation errors from the current web form. 3. Drag and drop seven Label controls in rows 3 through 9. Set their Text properties to Your Name :, Your Email :, Contacting For :, Subject :, Message :, Web Site (Optional) :, and You represent :, respectively. 4. Drag and drop a TextBox control after the Your Name, Your Email, Subject, Message, and Web Site (Optional) labels, respectively. Set the TextMode property of the Message text box to MultiLine. 5. Drag and drop a DropDownList control after the Contacting For label. 6. Drag and drop a RadioButtonList after the You Represent label. 7. Drag and drop a Button control to row 10 and set its Text property to Submit.
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CHAPTER 11 US E OF XML IN THE .N ET FRA MEWORK
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8. Drag and drop a Label control to row 11 and set its Text property to a blank string. This label will be used to display a success message to the user. 9. Select the DropDownList control. Open its property window and locate the Items property. Add four items in the DropDownList: Please Select, Sales Quotation, Technical Problem, and Other. 10. Select the RadioButtonList control. Open its property window and locate the Items property. Add two items in the RadioButtonList: Individual and Company. 11. Drag and drop a RequiredFieldValidator control in front of the controls that accept name, email, reason for contact, subject, and message. The RequiredFieldValidator control is used to validate that the control to which it has been attached contains some value. Set the ControlToValidate property of all the RequiredFieldValidator controls to the ID property of the respective text boxes or DropDownList. 12. Set the InitialValue property of the RequiredFieldValidator attached to the Contacting For drop-down to Please Select. This way, the user will need to choose an option other than Please Select. 13. Drag and drop a RegularExpressionValidator control in front of the controls that accept email and website. The RegularExpressionValidator control validates the entered value for a specific pattern. The pattern is set by using regular expression syntax. Set the ControlToValidate property of both the RegularExpressionValidator controls to the ID property of the respective text boxes. Set the ValidationExpression property of the first RegularExpressionValidator control to Internet Email Address. Similarly, set the ValidationExpression property of the second RegularExpressionValidator control to Internet URL. 14. Set the Text property of all the validation controls (RequiredFieldValidator and RegularExpressionValidator) to *. This text will be displayed in place of the validation control whenever there is a validation error. Also, set the ErrorMessage property of all the validation controls to some meaningful error message. The ErrorMessage will be displayed in the ValidationSummary control in the event of any validation error. Our web form design is now over. At the bottom of the web form designer, you will find a tab named Source. Click on it to see the markup generated for our web form. The relevant markup of Default.aspx is given in Listing 11-7. Listing 11-7. Server Control Markup from Default.aspx <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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