■ Removes all breakpoints in your project. Breakpoints tell
  Visual Basic to halt just before a specific line of code.
 
■ Use breakpoints to halt your project at a point where you
  suspect problems, then:
    • Test the values of variables in the Immediate window
      or with the Instant Watch command
    • Add variables to the Debug window and single step your
      project from the breakpoint forward
 
■ Tip: Use Toggle Breakpoint (or press F9) to turn individual
       breakpoints on or off.