vba - Code run automatically on changing cell value in Excel -


i trying run vba script run automatically when change cell value automatically. have script int worksheet , not module. reason not working , can't figure out why. have idea why? much! 

private sub worksheet_change(byval target range)  if target = range("b1")   r1 = range("b1").value range("a1").value = 2 * r1  end if  end sub

consider:

private sub worksheet_change(byval target range)     if target.address(0, 0) = "b1"         application.enableevents = false         range("a1").value = 2 * range("b1").value         application.enableevents = true     end if end sub

edit#1:

if fails work, not produce error message, may need re-enable events . put in standard module , run it:

sub eventson()     application.enableevents = true end sub

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