Web Server Controls in the ASP Development
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Web Server Controls is an outstanding feature of ASP.NET development. The article briefly explains Web Server Controls used in ASP.NET development.
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The ASP.NET page framework includes various web server controls designed to provide a structured programming representation for the web.
All ASP.NET controls are identified by their attribute 'runat="server". These controls can be compared to HTML controls. The only difference is that HTML controls run at the client side and developers have to write separate code for each browser type. On the other hand, ASP.NET web controls run on the server side and adapt automatically to the browser. At runtime, the ASP.NET engine will generate necessary CSS, HTML and JavaScript for each client browser. The biggest advantage of developers is that ASP.NET web server controls use and generate large amount of HTML tags, thus allowing them time to concentrate on coding instead.
These controls are definitely more powerful than HTML controls. Some controls are relatively simple but some are extremely difficult. If server controls didn't exist, a lot of time would have gone in coding to achieve the desired result. Hence these controls are the most frequently used component in ASP.NET.
One can focus on web page functionality and user-response with the help of web server controls. One example of an advanced functionality offered by web server controls is the calendar. The developer can add this to a web page and write codes to determine how it will respond to user interaction. Then at the runtime, necessary HTML markup is produced automatically, saving hours of coding and testing time and effort of the developer. Another example of a time-saving control is the FileUpload control. You can add a browse and upload facility to any web page with minimal coding. Other controls such as View server or MultiView controls are used together to control the visibility of different parts of a page. The end user is able to flow through the views in the sequence specified by the developer.
The Wizard Server control is another sophisticated control - it can set up a series of steps which can be presented to a user in the order you specify. Apt for building forms. It is similar to MultiView and View but offers a much greater extent of customization.
There are various built-in ASP.NET Web Server controls and you can even create your own controls. The ones mentioned in the article are the most popular and widely used ones.
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