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C H A P T E R 34
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ASP.NET is the .NET platform for building web applications. ASP.NET is a huge and feature-rich technology it is so big that the book Pro ASP.NET 4 in C# 2010, the Apress book about ASP.NET that I wrote with Matthew MacDonald, is more than 1,500 pages. In this chapter, we are going to look at two of the user interface technologies that ASP.NET supports: Web Forms and Dynamic Data. ASP.NET relies on Internet Information Services (IIS), which is an application server that has been enhanced to deliver ASP.NET applications to clients. IIS 7 is available as part of Windows and works particularly well on Windows Server. The latest version is IIS 7.5, which is supported on Windows 7 and Windows Server 2008 R2. You can get details of IIS, including instructions for deploying ASP.NET applications, at the Microsoft IIS site: www.iis.net. We won t be using IIS in this chapter. Instead, we will rely on the server that is built into Visual Studio and that can be used to test and debug projects. If you are using the Express edition of Visual Studio 2010, you will need to use the Web Developer version for this chapter. You can install Web Developer alongside the C# Express version, and the two will coexist quite happily. This chapter will follow the same approach as the previous two, in that we will create a web-based version of the swim calculator program and then look at how we can access data from the Northwind database.
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In this section, we will re-create the swim calculator program using ASP.NET Web Forms. I have referred to this as a stand-alone program in the Windows Forms and WPF chapters, but I am not sure that we could count any Web Forms program as being truly stand-alone. After all, we are talking about a web program that involves a browser and a server. Web Forms is, as the name suggests, the web counterpart to Windows Forms, and you will see the now-familiar properties and events model has been used again here.
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To create the project for this section, go to the Add New Project dialog box, select the ASP.NET Empty Web Application template, change the name to SwimCalculator, and click the OK button, as illustrated by Figure 34-1.
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CHAPTER 34 ASP.NET
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Figure 34-1. Creating the Web Forms project You will find the template under the Web category. Make sure you select the C# version if you are using Visual Studio Express because this edition includes Visual Basic templates with the same name. Select the project in the Solution Explorer window, right-click, and choose Add and Add New Item from the pop-up menus. Under the Web category, you will see the Web Form template; click this, and set the name of the item to Default.aspx. A web form is a special file that will be translated into an HTML page that will be displayed in a browser and a C# assembly that contains your program logic for processing the web page. This is similar to WPF, where XAML and C# are combined to provide the layout and the logic for a program window. Click the Add button to dismiss the dialog box, and add the item to your project. The editor for the Default.aspx file will open. Click the Split button at the bottom of the window, as shown in Figure 34-2.
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Figure 34-2. Selecting the split view The split view is similar to the one we used for WPF, except that we are working with HTML rather than XAML. Open the Toolbox window, and drag a Button control to the design surface. The Button control will appear on the surface, and the HTML will be updated in the other part of the split view. The tag that has been added to the HTML will be <asp:Button>, which is one that you probably haven t seen before. These tags are the secret sauce of ASP.NET Web Forms. When you compile a Web Forms application, there are two outputs: the assembly that contains your C# code and the .aspx file that
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