As you run your application, it may halt for one of the following reasons:
An untrapped run-time error occurs.
Visual Basic encounters a breakpoint you set previously.
Visual Basic encounters a watch expression that you have set to break if its value changes or becomes true.
Visual Basic encounters a Stop statement or an End statement in your code.
You halt execution manually at a given point.
To halt execution manually
From the Run menu, choose Break (Ctrl+Break), or use the toolbar shortcut:
To continue execution when your application has halted
From the Run menu, choose Continue (F5), or use the toolbar shortcut:
From the Debug menu, choose Single Step (F8) or Procedure Step (Shift +F8).
Chapter 2, "Your First Visual Basic Application"
Chapter 9, "Debugging"