December 2001
Beginner
464 pages
13h 51m
English
Content preview from Programming Visual Basic .NETBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Designing Custom Controls
ASP.NET provides the ability to define two kinds of custom controls: user controls and server controls. The purpose of both is the same: to encapsulate visual and programmatic behaviors for use on web pages. (For example, a control can be used to encapsulate a navigation bar that appears on every page in a site.) Their differences lie in how they are created and in their capabilities. User controls are created in much the same way as standard ASP.NET pages and can include HTML, embedded code, and code-behind files. This allows web developers to quickly and easily create controls using techniques with which they are already familiar. In contrast, server controls are created entirely in code and provide much more sophisticated control over rendering, postback processing, and event generation. This means that custom server controls can do everything that built-in ASP.NET server controls can do. Even so, user controls are usually the right choice because they are so simply created. Server controls are not needed unless user controls are not sufficient for a given purpose. This section shows how to create both kinds of controls.
User Controls
The easiest way to create a new control
is to aggregate and modify the functionality of one or more existing
controls. This is done by creating a user-control file
(.ascx
) and then referencing it from a web page
file (.aspx). Example 6-17 shows
a simple user-control file.
Example 6-17. A user control for implementing ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.