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CHAPTER 10 INTRODUCTION TO VISUAL WEB DEVELOPER EXPRESS, WEB PAGES, AND WEB FORMS
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Note ASP.NET control attributes correspond to ASP.NET control properties. The Text property for a Web Form control is similar to the Text property for a Windows form control. Both Text properties serve as control captions. However, the ID property for Web Form controls acts similarly to the Name property for Windows form controls in that both the ID and Name properties provide a programmatic handle for a control.
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Running an ASP.NET Page
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After you build a solution, it is natural to want to test it. This step helps you to detect and eliminate bugs and faulty program logic, preview the solution with a client to get additional feedback, or finetune the solution for your own needs. When running a file-system website, as is the case for WebSite1, you do not actually have a website to which users from other computers can connect. However, you can easily run the AssignPageTitle.aspx file. This will show whether the page compiles and, if so, the result it generates. When you run the page file in a file-system folder instead of a Web-server folder, VWDE invokes the ASP .NET Development Web Server instead of either a local or a remote Web server. You can run the page by choosing Debug Start Without Debugging. The shortcut keystroke for this menu command is Ctrl+F5. Figure 10-5 shows a browser session after a click to the Assign title button. Notice the page s title reads Title is assigned. This is the outcome of the Button1_Click procedure. Before a click to the button, the title was Title is not assigned. The change of title is the outcome of the Page_Load procedure. VWDE automatically populates the Address box, which references the AssignPageTitle.aspx file in the WebSite1 website. Notice the button on the page displays the name of the corresponding Button control s Text attribute setting.
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Figure 10-5. You can test an ASP .NET page with the ASP .NET Development Web Server when you are running from a file-system location.
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Returning a Formatted Date from a Calendar Control
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One of the great features of ASP .NET is its rich set of controls. Among the most interesting of the ASP .NET controls is a Calendar control that enables a user to pick a date from a calendar and returns a corresponding Visual Basic 2005 Date value. Recall from the Date Data Types and the Timespan Structure section in 9 that this data type returns both the date and time. When there is no time element for a Date value, as with the return value from a Calendar control, VWDE sets the time element to midnight, the first time instance within a day. The sample in this section shows how to display the return value from a Calendar control before and after formatting to hide the time element.
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CHAPTER 10 INTRODUCTION TO VISUAL WEB DEVELOPER EXPRESS, WEB PAGES, AND WEB FORMS
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You can start the building of the sample by adding a new Web Form item to the WebSite1 project. In the Add New Item dialog box, assign the name CalendarFormattedDate to the new Web Form page. In addition, select the check box for placing code in a separate file. Recall that this selection causes the creation of a separate, coordinated file for the code behind the Web Form page. This sample uses three views in two separate files for the CalendarFormattedDate page. The CalendarFormattedDate.aspx file is the page with the HTML formatting for the page. This page has both Source and Design views. The CalendarFormattedDate.aspx.vb file contains the code behind the Web Form in a partial class. Settings in both the first and second files cause them to reference one another.
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Note
The ASP.NET 2.0 code-behind model takes advantage of a new .NET Framework version 2.0 language feature known as partial classes. The code-behind file for a page is not a complete class definition. You can designate the file implementing a partial class with the CodeFile attribute setting for a Web Form @Page directive. The Inherits attribute for a Web Form @Page directive denotes the base class for a Web Form page. See the Exploring a New ASP.NET Project section for additional coverage of Web Form @Page directive attributes.
VWDE specifies a set of @Page directive attributes for the CalendarFormattedDate page in response to the settings on the Add New Item dialog box during the creation of the Web Form. You can view these settings at the top of Source view for CalendarFormattedDate.aspx. The Language attribute equals VB, for the persisted Visual Basic setting in the Add New Item dialog box. The AutoEventWireUp attribute setting is false. Recall that this setting designates reliance on the Handles clause for determining which procedure replies to an event for an object. The OnClick attribute for a control tag cannot reference a procedure in another file, but the Handles clause can reference an object in another file. The two files in this sample are CalendarFormattedDate.aspx CalendarFormattedDate.aspx.vb The CodeFile attribute setting points at CalendarFormattedDate.aspx.vb from CalendarFormattedDate.aspx. The Inherits attribute setting is CalendarFormattedDate, which is the class name for the current page. VWDE creates the CalendarFormattedDate class in response to the Add New Item dialog box settings. The following excerpt from the CalendarFormattedDate.aspx.vb file shows a Partial Class declaration at the top of the file. The name following Partial Class is CalendarFormattedDate. This statement designates the class referenced by the CalendarFormattedDate.aspx.vb file as the same one referenced by the CalendarFormattedDate.aspx file. Partial Class CalendarFormattedDate Inherits System.Web.UI.Page
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