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Beginning Active Server Pages - Debugging

Debugging

Developers who make regular use of the VB debugging tools will be in for a shock - there are virtually none for ASP! On your local server, you usually receive a 505 error when there is a scripting error, along with the error description and line number that it occured on.... and that is just about it. If you have a custom 505 error page, you won't even be able to get that.

Note that if you have started sending information to the browser (after a Response.Flush call, or with buffering disabled - see performance section), then you an error will be outputted with your HTML. However, if the error occured in VB code, which is within a table, then you may well not see it... you will need to go to View | Page Source in order to find out what went wrong!

At the moment, Visual InterDev provides the best debugging tools, which are remenicsent of VB. Otherwise, you will simply have to revert to putting Response.Write "doing something..." to check that things are running as you expect. As always, use of the Option Explicit statement also prevents you getting into a mess with variable names. Other than that, you are on your own.... sorry!

James first started writing tutorials on Visual Basic in 1999 whilst starting this website (then known as VB Web). Since then, the site has grown rapidly, and James has written numerous tutorials, articles and reviews on VB, PHP, ASP and C#. In October 2003, James formed the company Developer Fusion Ltd, which owns this website, and also offers various development services. In his spare time, he's a 3rd year undergraduate studying Computer Science in the UK. He's also a Visual Basic MVP.

Comments

  • Re: [1010] Beginning Active Server Pages - absolute beginner!

    Posted by michael poxon on 16 Dec 2006

        Hi,
    When I say I'm an ASP beginner, I mean it! I've only written one trivial bit of code, and got a blank page. I see now that's described in the article snippet below. I did ind...

  • .I want to know how to save the files.whats the extensions...

    Posted by writetoksk on 04 Oct 2006

    hi,


    its first i started ASP.I want to know how to save the files.whats the extensions...Where can i get the sample programs

  • Posted by James Crowley on 28 Dec 2004

    Are you running IIS ? And are you viewing it in your browser via the correct URL? (ie something starting with http:// rather than file:// ) ?

  • Posted by James Crowley on 28 Dec 2004

    It does - you just can't see it ;) We've got an ISAPI filter that rewritse /show/1010/ to something like /show.aspx?id=1010

  • It's not working ;_;

    Posted by HyperHacker on 12 Dec 2004

    Is there something special I have to do besides saving it as a .asp file, or does it just not work on my server? It just spits out the code, even HTML, as plain text.

    [code]
    Let's see if ASP...