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Editorial Team
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Asked: 2026-05-17T16:53:47+00:00

Suppose I have a class library cl1 and a unit test for it that

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Suppose I have a class library cl1 and a unit test for it that is called clt1. I can use Visual Studio’s Attach to Process feature to attach to NUnit runner. This lets me debug cl1, for example set break points. It’s a very helpful feature for debugging.

I’m in a need of this technique in Visual Studio and IE/FF. Suppose I have a web application that utilizes cl1. This application is running via ASP.NET Web Development Server or IIS. I want to debug (set break points) in cl1. How can I do this?

Please notice that it’s not possible through Visual Studio itself. Because something in markup is calling cl1 classes and I can’t set a break point in ASP.NET markup. I’m running Visual Studio 2010 Ultimate.

UPDATE:

cl1 is running as server side

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  1. Editorial Team

    As your code is running server-side, you need to attach the debugger to the server (IIS, or dev server, whichever you are running).

    What I normally do is set my breakpoint, browse to the site (in order to ensure that the site is running and has been “warmed up”) then Debug -> Attach and find the process running the web server to attach to. I then browse to where my code will be run and go through the steps to execute it.

    If IIS is running on a different server, you can do remote debugging.

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