September 2007
Beginner to intermediate
520 pages
16h 1m
English
Content preview from Learning ASP.NET 2.0 with AJAXBecome 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 8. Errors, Exceptions, and Bugs, Oh My!
Every computer programmer has run into bugs. It comes with the territory. Many bugs are found during the coding process. Others pop up only when an end user per-forms a specific and unusual sequence of steps or the program receives unexpected data. You should always try to find bugs early in the development process and avoid having end users find your bugs for you. Countless studies have shown that the earlier you find a bug, the easier and less expensive it is to fix.
If your program does run into a problem, you will want to recover quickly and invisibly, or, at worst, fail gracefully. ASP.NET provides tools and features to help reach these goals:
- Tracing
You can trace program execution at either the page or application level. ASP.NET provides an extensible trace log with program life-cycle information.
- Symbolic debugging
You can step through your program line by line, set breakpoints, examine and modify variables and expressions, and step into and out of classes, even those written in other languages.
- Error handling
You can handle standard or custom errors at the application or page level. You can also show different error pages for different errors.
To get started exploring the ASP.NET debugging tools, you should first create a simple web site to which you will add tracing code. You will then introduce bugs into the program and use the debugger to find and fix the bugs.
Creating the Sample Application
To start, create a new web site ...
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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.