Continuing down the list of Tools – Options – Debugging – General settings, there’s the Enable Source Server Support option.
According to the documentation, Tells the Visual Studio debugger to get code from the SrcSrv source server (srcsrv.dll), which is part of Debugging Tools for Windows. For information about SrcSrv setup, see the Debugging Tools for Windows documentation. For more information, see How to: Get Source Code Using Source Server.
You need to enable this option to debug the .NET Framework.
Shawn Burke, who I greatly envy his ability to exercise for 11 hours straight in Ironman competitions while I break a leg climbing a mere mountain twice in a row, explains how to debug .NET Framework source code, where you’ll see this option mentioned.
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