No Source Available
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Your project does not contain source code for the code that you are trying to view. The usual cause is double-clicking a module that does not have source code in the Call Stack Window or Threads Window. You can continue to debug, but cannot use the source window to set breakpoints and perform other actions at this location. If you need to set a breakpoint, use the Disassembly Window instead.
In the Solution Property Pages, you can change the directories where the debugger looks for sources files and tell the debugger to ignore selected source files. See Debug Source Files, Common Properties, Solution Property Pages Dialog Box.
Browse to find source code
Click this link to open a dialog box where you can browse to find the source code.
Launches the Disassembly Window.
Always show disassembly for missing source files
Select this option to display the Disassembly Window automatically when no source is available. This setting can also be changed in the Options dialog box, Debugging category, General page, by selecting or clearing Show disassembly if source is not available.
Debug Source Files, Common Properties, Solution Property Pages Dialog Box
Specify Symbol (.pdb) and Source Files
SOS.dll (SOS Debugging Extension)