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Editorial Team
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Asked: 2026-05-28T08:00:49+00:00

I’m working on a project in Silverlight and somewhere an exception is thrown. I’m

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I’m working on a project in Silverlight and somewhere an exception is thrown. I’m not concerned with fixing the exception… I just want to find it.

Instead of Visual Studio popping up and showing the the line where the exception happened, I instead get a little window labeled “Just In Time” which mentions an error 4004, a managed runtime error. It asks which debugger I want to use to solve the problem. But, it only provides one option: a new instance of Visual Studio. If I try to accept its proposal, the new instance complains that a debugger is already attached.

Why doesn’t the instance of VS which built the program and is already running catch the exception and show me where it is?

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1 Answer

  1. Editorial Team

    That is strange behavior. The first thing I would do is change a few settings

    • Disable Just My Code
    • Enable native debugging
    • Break on first exception thrown

    This should help you narrow down the place where the exception is occuring.

    Disable Just My Code

    • Tools -> Options
    • Debugger
    • Uncheck “Enable Just My Code”

    Enable Native Debugging

    • Right click on the project and select properties
    • Go to the Debug Tab
    • Check “Enable Unmanaged Debugging”

    Break on first exception thrown

    • Debug -> Exceptions
    • Check “Throws” for Common Language Runtime Exceptions
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