Benefits of ASP.NET Controls

ASP.NET has solved the "spaghetti-code" problem described above with server controls. Server controls are tags that are understood by the server. There are three kinds of server controls:

• HTML Server Controls - Traditional HTML tags
• Web Server Controls - New ASP.NET tags
• Validation Server Controls - For input validation

ASP.NET - HTML Server Controls

HTML server controls are HTML tags understood by the server.

HTML elements in ASP.NET files are, by default, treated as text. To make these elements programmable, add a runat="server" attribute to the HTML element. This attribute indicates that the element should be treated as a server control. The id attribute is added to identify the server control. The id reference can be used to manipulate the server control at run time.

ASP.NET - Web Server Controls

Web server controls are special ASP.NET tags understood by the server.

Like HTML server controls, Web server controls are also created on the server and they require a runat="server" attribute to work. However, Web server controls do not necessarily map to any existing HTML elements and they may represent more complex elements.

ASP.NET - Validation Server Controls

Validation server controls is used to validate user-input. If the user-input does not pass validation, it will display an error message to the user.

Each validation control performs a specific type of validation (like validating against a specific value or a range of values).

By default, page validation is performed when a Button, ImageButton, or LinkButton control is clicked. You can prevent validation when a button control is clicked by setting the CausesValidation property to false.

Why use ASP.NET controls at all? Using these controls provides four important benefits:

• ASP.NET controls expose the HTML elements of a page in an intuitive object model.

• ASP.NET controls automatically retain the value of their properties by participating in view state.

• ASP.NET controls enable you to cleanly separate the design content of a page from the application logic.

• ASP.NET controls enable you to maintain browser compatibility while still supporting advanced browser features such as JavaScript.

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