Why does F10 (step over) in Visual Studio not work?

Question

I'm debugging a (web) project in Visual Studio 2008. I'm hitting a breakpoint. F10 continues to the next line, as expected, but the next F10 just stops debugging and the code continues without any more debugging (like pressing F5). Why is this happening?

• I have tried 'clean solution'.
• Other breakpoints sometimes(!) skipped, even in the same method

Any clues?

Answer 1

It is probably because you do not have the update kb 957912 for Visual Studio 2008. That fixed the same issue on my machine.

Answer 2

Make sure that you're in Debug mode not in Release.

Answer 3

Without knowing more about your application it's difficult to say, but usually this sort of thing happens when the process starts a thread or otherwise goes into code where there isn't any debug information.