Actually VB Express show the source in a separate window with breakpoint, though with no language syntax highlight or other debug info. This was for a C++ clr class library, with pdb, same for both debug and release. It was slightly disappointing it didn't open the debug in the other languages Express environment, though I can understand it is the executing debugger that rules. I don't think it's related to other Express languages being installed, since the 'result' is displayed as explained in VB Express. You're right the pdb is required though, jmcilhinney.