September 2005
Intermediate to advanced
576 pages
14h 23m
English
Content preview from Programming Visual Basic 2005Become 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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Chapter 13. Custom Controls
In ASP.NET, Microsoft distinguishes between user controls , which are segments of ASP.NET pages that can be reused in other pages, and custom controls, which are compiled controls that act, from the client's perspective, much like web (ASP) controls. Custom controls can be created in one of three ways:
By deriving a new custom control from an existing control (e.g., deriving your own specialized text box from
asp:textbox). This is known as a derived custom control.By combining two or more existing controls into a new control. This is known as a composite custom control.
By deriving from the base control class, thus creating a new custom control from scratch. This is known as a full custom control.
User Controls
User controls allow you to save a part of an existing ASP.NET page and reuse it in many other ASP.NET pages. A user control is almost identical to a normal .aspx page, with two differences: the user control has the .ascx extension rather than .aspx, and it cannot have <HTML>, <Body>, or <Form> tags.
The simplest user control is one that displays HTML only. A classic example of a simple user control is an HTML page that displays a copyright notice. To demonstrate this, create a new web application named UserControls. Once the application is open, right-click on the project and choose Add New Item. Highlight Web User Control and name your new control Copyright.ascx, as shown in Figure 13-1.
Example 13-1 shows the complete listing for Copyright.ascx
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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.