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CHAPTER 10 INTRODUCTION TO VISUAL WEB DEVELOPER EXPRESS, WEB PAGES, AND WEB FORMS
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Creating Pages for an ASP.NET Project
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Creating and designing pages for a website is a very deep topic. After all, the main purpose for navigating to a site is what s at the site, and Web pages compose what s at a site. ASP.NET projects offer tools for creating rich interactive experiences that go beyond what is typical for other types of Web projects. In addition, it is particularly easy to engineer this interactivity with VWDE. One main vehicle for making pages interactive is through the use of ASP .NET controls on a special type of Web page known as a Web Form. This section demonstrates how to create Web Form pages and offers samples that highlight different techniques for making pages interactive.
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Changing a Page by Clicking a Button
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ASP .NET simplifies how a Visual Basic developer can manage a website. You can program pages on the server with special built-in controls and the ASP.NET object model. The sample for this section manages the Title property of a Web Form. The Title property value is the text that appears in the top-left corner of a Web browser showing a page. This property maps to the title element within the head block of the HTML for a page; see Figure 10-2 for the tags defining the title element within the head block.
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HTML tags define the elements and sections or blocks of a Web page. Tags often nest within one another. The opening and closing html tags (<html> and </html>) define the outermost HTML tags for a page. Within the html block is the head block (<head> and </head>). An element designates a set of opening and closing tags without another element or block within it. The title element (<title> and </title>) can exist within the head block.
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By default, ASP.NET initializes the title element (or Title property) to Untitled page. The sample application initializes the Title property to Title not assigned during the Load event for a page. The Click event procedure for an ASP .NET Button control on the page changes the page s Title property value to Title assigned.
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You can view the properties of a block or an element that are available for manipulation by clicking the element or block s opening tag. The Properties window shows the properties for the selected block or element.
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Starting a Web Form with a Single-file Code Model
You can run Visual Basic 2005 server-side code from a Web Form page. This is a page configured to run ASP .NET controls. You can place server-side code for a page on the same page as your HTML or in a different, but coordinated, file. When you initially create a Web Form, you can choose: The default language for the page Whether your server-side code appears in the same file as the HTML or in a different, related file Whether the page is a master page
CHAPTER 10 INTRODUCTION TO VISUAL WEB DEVELOPER EXPRESS, WEB PAGES, AND WEB FORMS
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Master pages are a formatting aid to help website authors develop a consistent look for the pages at a website. See the Master Pages section of the online chapter available at http://www.apress.com/book/ bookDisplay.html bID=459 for additional coverage of the topic.
To add a new Web Form to a project, right-click the solution name in Solution Explorer and choose Add New Item. You can also open the Add New Item dialog box with the File New File menu command. Figure 10-3 shows the Add New Item dialog box with a Web Form item selected. The name for the new file in the WebSite1 project will be AssignPageTitle.aspx. Notice that the check box is unselected for Place code in separate file. This means that the Visual Basic 2005 code for the page will be in the same file as the HTML for the page. As you can see from Figure 10-3, ASP .NET offers two models for where your server-side code goes. The single-file code model includes server-side code and HTML in a single file. Leaving the Place code in separate file check box unselected invokes this model. Selecting the check box for Place code in separate file creates separate, but coordinated, page files for the HTML and the server-side code for an ASP .NET page. This approach is the code-behind-page code model.
Figure 10-3. When you add a new Web Form to a project with the Add New Item dialog box, you can specify either a single-file or code-behind-page code model. If you have significant experience with either classic Visual Basic or Visual Basic .NET, you are likely to find the code-behind-page code model more familiar. This approach isolates your Visual Basic code from your page layout code. In contrast to Visual Basic developers, many Web developers come from a background in which it is common to mix HTML and other code in a single file. These two different approaches to managing page content appeal to different development styles:
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