"PDB does not match image" error in C# VS2010 project

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I've been using a library in my code base for a while now, and I wanted to debug right into the library level. To do that, I downloaded the source code and included the project as an existing project into my C# solution. I then had my other projects reference that project instead of the downloaded .DLL.

Once the project was referenced instead of the DLL, I ran my solution through the debugger and tried to step into a function call that would have called into the external project, but it stepped right over it. While debugging, I opened up the "Modules" window and saw that the DLL's Symbol Status read "PDB does not match image", which is the likely cause of not being able to debug this project.

My question is simple, why does the PDB not match the image if my project is directly referencing the .csproj file as a reference? There should never be any ambiguity as to what version to run.

pdb-files visual-studio-2010 visual-studio .net c#
5 Answers

This happened to me today while I was trying to debug notepad++ dll plugin , I had to change build output directory to notepad++'s plugins directory and set the Debugger to launch notepad++ instead of the current project dll to proceed with set breakpoint. This had me nuts as Visual Studio 2019 was telling me that SYMBOLS were not loaded for the plugin dll which I was trying to debug.

Finally checking the modified date and time as others here suggested, made me realize the pdb was not up to date with the the build output dll timestamp. I tried rebuilding the solution but the pdb generated has same older timestamp though I delete them manually and initiate build. So all I had to do was to make a change in the source code by deleting a white space and rebuild. Voila! this time I got the debugger to load the symbols for my dll automatically and hit the set breakpoint.

Maybe cleaning the solution also might have worked.

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