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Overview
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The increased use of the Internet in the business scenario has shifted focus from desktop applications to Web-based applications. Because of this shift in focus, a Web development technology is needed that can combine the capabilities of different languages and simplify application development. Microsoft's response to this need is the release of ASP.NET, which provides a common Web development platform. ASP.NET is a powerful programming platform that is used to develop and run Webbased applications and services. ASP.NET provides improved features, such as convenient debugging tools, over the earlier Web development technologies. ASP.NET provides a rich set of controls to design Web pages. Visual Studio .NET provides visual WYSIWYG (What You See Is What You Get) HTML editors. Therefore, you can design Web pages by simply dragging and dropping the controls. ASP.NET supports the C#, Visual Basic .NET, and JScript .NET languages, all of which you can use to build programming logic for your Web pages. You can choose which one of these languages to use based on your proficiency on a particular language. One of the most important features of ASP.NET is that it provides separate files for page presentation and programming logic, which simplifies Web application development. This chapter introduces you to designing simple Web pages by using basic Web controls. You'll also learn how to handle various events of these controls.
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Introducing ASP.NET Web Forms
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The ASP.NET Web Forms technology is used to create programmable Web pages that are dynamic, fast, and interactive. Web pages created using ASP.NET Web Forms are called ASP.NET Web Forms pages or simply Web Forms pages. ASP.NET uses the .NET Framework and enables you to create Web pages that are browser independent. In addition to being browser independent, the following are some of the features that may lead you to select Web Forms over other technologies to create dynamic Web pages: Web Forms can be designed and programmed using Rapid Application Development (RAD) tools. Web Forms support a rich set of controls and are extensible, because they provide support for user-created and third-party controls. Any of the .NET Framework language can be used to program the ASP.NET Web Forms pages. ASP.NET uses the Common Language Runtime (CLR) of the .NET Framework and thus benefits from its features, such as type safety and inheritance.
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Web Forms components An ASP.NET Web Forms page consists of a user interface and programming logic. The user interface helps display information to users, while the programming logic handles user interaction with the Web Forms pages. The user interface consists of a file containing a markup language, such as HTML or XML, and server controls. This file is called a page and has .aspx as its extension. The functionality to respond to user interactions with the Web Forms pages is implemented by using programming languages, such as Visual Basic .NET and C#. You can implement the programming logic in the ASPX file or in a separate file written in any CLR-supported language, such as Visual Basic .NET or C#. This separate file is called the code behind file and has either .aspx.cs or .aspx.vb as its extension depending on the language used. Thus, a Web Forms page consists of a page (ASPX file) and a code behind file (.aspx.cs file or .aspx.vb file). Web Forms server controls You can design a Web Forms page by using controls called Web Forms server controls. You can program the functionality to be provided for the server controls. The server controls are different from the usual Windows controls because they work within the ASP.NET Framework. The different types of server controls are described as follows: HTML server controls: These controls refer to the HTML elements that can be used in server code. The HTML elements can be converted into HTML server controls. To do so, you need to use attributes, such as ID and RUNAT, in the tags that are used to add the HTML controls. You can also add these controls to the page by using the HTML tab of the toolbox. The different tabs of the toolbox are shown in Figure 3-1.
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Figure 3-1: The Visual Studio .NET toolbox ASP.NET server controls: These controls do not map one-t o-one to HTML server controls. ASP.NET server controls include traditional form
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controls, such as text boxes and buttons, and complex controls, such as tables. Validation controls: These controls are used to validate users' input. Validation controls can be attached to input controls to check the values entered. User controls: These controls are created from the existing Web Forms pages and can be used in other Web Forms pages.
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