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To debug .NET Framework source, you must:
Enable stepping into .NET Framework source.
Have access to debugging symbols for the code.
You can choose to download debugging symbols immediately, or set options for later downloading. If you don't download symbols immediately, they'll download the next time you start debugging your app. While debugging, you can also use the Modules or Call Stack windows to download and load symbols.
Enable stepping into .NET Framework source
Set or change symbol source locations and loading behavior
To add other symbol locations, select Add and update existing locations by selecting Edit. Change the loading order of the locations with Move up and Move down.
To change your local symbols cache, edit or browse to a different location by selecting More actions (...) for the Cache symbols in this directory option.
To download symbols immediately, select Load all symbols. This button is available only while debugging.
If you don't download symbols now, the download happens the next time you start debugging.
Load symbols from the Modules or Call Stack windows
During debugging, open the window by selecting Debug > Windows > Modules (or press Ctrl + Alt + U) or Debug > Windows > Call Stack (Ctrl + Alt + C).
Right-click a module for which symbols weren't loaded. In the Modules window, symbol loading status is in the Symbols Status column. In the Call Stack window, status is in the Frame Status column, and the frame is grayed-out.
Select Load Symbols from the menu to locate and load symbol files from a folder on your machine.
Select Symbol Load Information to show the locations the debugger searched for symbols.