Several months ago Scott Guthrie mentioned that developers will be able to debug the .NET Source Code. Now it is formalized and Shawn Burke has a cool post on how to do so. It is a step by step procedure on how to setup VS to be able to debug .NET code.
I have already did it and it works great!
Check his post here: Configuring Visual Studio to Debug .NET Framework Source Code
Hope this helps,
Regards
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