I am using SourceSafe 6.0d and Visual Studio 2005.

I have written a SourceSafe addin (ie. IVSSEventHandler using ssapi.dll and ssaddin.ini). It runs fine from SourceSafe application if I have the dll in the SourceSafe dll (C:\Program Files\Microsoft Visual Studio\Common\VSS\win32), but doesn't run from Visual Studio. It runs fine from Visual Studio if I have it in the Visual Studio directory (C:\Program Files\Microsoft Visual Studio 8\Common7\IDE), but then it doesn't run from SourceSafe.

My question is:
Is there ONE location I can place the addin dll so that it runs from BOTH SourceSafe and Visual Studio? or is it necessary to duplicate this dll?

I did eventually figure it out. I needed to install the assembly into the global assembly cache (GAC) and then it was visible to both applications. To do this I needed to sign the assembly with a strong name.

In brief, I did this by:

1) Creating a key file the strong name tool: sn.exe -k mysnkfile.snk
2) Signing the assembly: Project properties -> Signing -> Sign the assembly -> mysnkfile.snk
3) Installing the assembly to the gac after building: Project properties -> Build Events -> Post-build event command-line -> "$(FrameworkSDKDir)Bin\gacutil.exe" -if $(TargetPath)

These aren't the steps I would follow if I were deploying this assembly, but this a developer-only tool so it does the job.

The SourceSafe addin dll is written in C# .Net .

I did eventually figure it out. I needed to install the assembly into the global assembly cache (GAC) and then it was visible to both applications. To do this I needed to sign the assembly with a strong name.

In brief, I did this by:

1) Creating a key file the strong name tool: sn.exe -k mysnkfile.snk
2) Signing the assembly: Project properties -> Signing -> Sign the assembly -> mysnkfile.snk
3) Installing the assembly to the gac after building: Project properties -> Build Events -> Post-build event command-line -> "$(FrameworkSDKDir)Bin\gacutil.exe" -if $(TargetPath)

These aren't the steps I would follow if I were deploying this assembly, but this a developer-only tool so it does the job.