I am using Visual Studio 2012. I want to Debug .NET Framework source code. I have tried nearly all the options but I am still getting There is source code available for Cu
In VS 2008 I was able to debug .Net source, but in VS2012 I've got .NET Reflector (VS extension) installed, so it automatically decompiles and allows to debug any .Net code.
Another open source tool is ilspy.net , it saves the decompiled assembly as C# project and you can use the debugging tools.
There are also debugging tools for Windows, that come as part of SDK, but i haven't tried those: http://msdn.microsoft.com/en-us/windows/hardware/gg463009.aspx