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CHAPTER 10 INTRODUCTION TO VISUAL WEB DEVELOPER EXPRESS, WEB PAGES, AND WEB FORMS
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On the one hand, Visual Basic developers may prefer the single-file code model for simple files with just a few lines of Visual Basic 2005 and HTML code because of the convenience of having all content in a single file. On the other hand, as the number of lines of code grows, this convenience will be offset by the drudgery of scrolling back and forth between script blocks with Visual Basic 2005 code and page blocks with page layout code for formatting text and controls. Another advantage of isolating the HTML and Visual Basic 2005 code pertains to teams made of HTML authors and VB developers. In this scenario, an HTML author can work on one file, and a VB developer can work on another file. However, ASP .NET can integrate the two files when rendering pages to a browser.
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Formatting a Page
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A typical ASP .NET page has one or more ASP .NET controls and several associated event procedures. The ASP .NET object model has a Page object that, in turn, has properties corresponding to the HTML for a page. Although you can assign page property values at design time from the VWDE IDE, you cannot change these properties at runtime from the IDE. Event procedures in the sample for this section illustrate how to dynamically change these attributes at runtime. The sample application uses an ASP.NET Button control to let a user specify when to change a page property. Before the Click event procedure for the Button control fires, the Load event procedure for the page initializes the Title property to a different default value than the one assigned by the Web Form template in the Add New Item dialog box (see Figure 10-3). The implementation of this sample involves three steps: Add an ASP.NET Button control to the page. The default identifier for this control is Button1. Add shells for the Page_Load and Button1_Click event procedures. Add code to each procedure that assigns a value to the page s Title property. You can drag a Button control to an ASP.NET page from the Standard group in the toolbar. The layout for the sample solution positions the Button control between two built-in tags for the page. You can re-create the layout for the Button control in the sample solution by dragging a Button from the Standard group in the Toolbox to an empty line that you insert between the </div> and </form> tags (a div block is a generalized container for text and other items, such as controls, that can also accept formatting and pass it on to its contents). Make the empty line by pressing Enter with your cursor immediately after </div>. If the toolbox is not already open, choose View Toolbox. If the Standard group is not already open, click the plus (+) next to Standard. Drag a Button control from the Standard group to the empty line. Change the Text attribute in the Button control tag from Button to Assign title. Next, you can add Page_Load and Button1_Click event procedure shells to a script block that appears between the @Page directive and the html block. You can use the Object drop-down box at the top of the Source view to specify the object and the Event drop-down box to designate the objectevent pair for a procedure shell. When you complete your selection from the Event drop-down box, the VWDE IDE automatically adds the corresponding event procedure shell to the script block.
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CHAPTER 10 INTRODUCTION TO VISUAL WEB DEVELOPER EXPRESS, WEB PAGES, AND WEB FORMS
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The final formatting step for the page is to add a single line of code to each event procedure shell. Figure 10-4 shows the Source view for the AssignPageTitle.aspx file. The Me keyword in the two event procedure shells refers to the current ASP .NET page. You can select the Title property for Me with the help of IntelliSense. The head block nested in the html block shows the default assignment for the Title attribute by an ASP.NET page. Without the Page_Load event procedure, the page s title would initially be the value designated in the head block. The Button control tag and its settings illustrate several interesting features. The Button control s tag appears with an asp prefix. A colon delimits the prefix from the control name. The tags for other ASP .NET controls also have an asp prefix. This asp prefix designates a special namespace for processing these tags versus standard HTML tags. The Text attribute value for the Button control is Assign title. The OnClick attribute designates the procedure for processing the Button control s Click event. The OnClick attribute value points at the Button1_Click procedure. There is no closing Button tag (</asp:Button>). Using a forward slash (/) at the end of an opening tag represents a closing tag.
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Figure 10-4. With a single-file code model, your event procedures appear in a script block above the HTML code formatting a page.
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