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Asked: 2026-05-10T17:22:21+00:00

When I add a breakpoint and hit F5 to run in the debugger (I

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When I add a breakpoint and hit F5 to run in the debugger (I am using my debug build), a dialog pops up telling my my web.config file does not have debug=true in it (which is does) and I get 2 choices a) run without the debugger or b) let visual studio update my web.config file. If I choose b) the web.config is updated badly and nothing will work. If I choose a) then the site appears and I can test it out, but no debugging.

I am an experienced developer, but I have never used visual studio and asp.net for web development before, so I am feeling rather frustrated by all the walls it is putting up to prevent me working.

So far I have not been able to use the debugger. Is there something totally obvious that I am missing? What would you check if it was happening to you?

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  1. Open web.config manually and make sure the following line is in there

    <compilation defaultLanguage='c#' debug='true' />

    Now you should be able to debug from VS. If this does not work I suggest that you recreate the project.

    EDIT: perhaps from what you say it could be that web.config is screwed up, e.g.contains invalid xml, no closing tag for some element etc.

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