How to debug a .dll?

I have a .dll attached to my project(I made the 开发者_开发知识库.dll). I have in the .dll project configuration set to "Active (Debug)".

I even deleted the .dll then added break points to the .dll code and rebuilt it and added back to my project and I still can't go inside the .dll and debug it.

I not sure what I am missing?

Place a breakpoint on the consuming code that calls into the .dll. When your project breaks there, step into the call (F11, by default).

Otherwise, I'd strongly suggest importing the project from which the .dll is built into the solution of the project that is attempting to consume it. This is the arrangement that makes VS happiest and causes the least headaches from versioning, switching between solutions, etc.

You'll have no difficulty debugging then.