Unable to build in VS2008

I’m sitting and trying to resolve an error in my application. It is the handling of images from the database, to the WPF gui. I have written a post about this in Swedish which I will translate when I have resolved the problem I have now. But this post is not about that, this post is about the annoying  build error
Unable to copy file "obj\Debug\exe-file" to "bin\Debug\exe-file.exe". The process cannot access the file 'bin\Debug\exe-file.exe' because it is being used by another process.

I’ve tried several ways to get around this, but it seems to be very hard, especially when GDI+ is involved. But one thing I’ve found that helps is to first kill the process vshost.exe for the current project. (It will be directly restarted), then I choose Clean Solution under the Build menu in VS2008, then I can build the solution again. I think the trick lies in killing the vshost.exe process.