thank you for you answer.
I'm not sure why you're seeing the behavior that you are getting with the assemblies and XML comments as documentation sources. The build steps don't look right. For one thing, neither SHFB nor Sandcastle invoke csc.exe and there is no "Assembling-Task".
It could be that you've got a build order issue. You may need to make the project that invokes SHFB in its post-build step, the final project to build.
OK, I will check the command for create the doc. It is normaly started from the commandline over night in a seperate process after the buildprocess.
In any case, if you can't use the solution file, add the projects you want documented within the solution as documentation sources instead (the .csproj or .vbproj file rather than the .sln file).
The solution contains over 140 Projects on different places but only one binary-folder.
It is much easier to handle one solution-file or all dll/xml-files in one folder as so many projectfiles.
This big solution we can also not handle after every build