No source code available for the current location

Project does not contain what you are trying to viewCodeOfSource code. The reason is that the module without source code is double-clicked in the "call stack" window or "Thread" window. You can continue debugging, but you cannot use the source code window to set breakpoints and perform other operations at this location. To set breakpoints, use the Disassembly window.

On the Solution Properties page, you can change the directory of the debugger to find the source file and notify the debugger to ignore the selected source file. See Solution Properties dialog box> Common Properties> debug source file ".

Automatic Display Disassembly
Disable this dialog box and automatically start the Disassembly window when no source code is available.

Display Disassembly
Start the Disassembly window, but do not disable this dialog box.
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Reference