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How to total numbers from 3 text boxes and display automatically in fourth

I have a form with three separate text boxes. I have a fourth text box in which I want to show the totals of the other three boxes as I after I type them in, but before I close (and save) the form. I don't have any code written for this at this time so the sky is the limit.

Text box names are as follows:

Hours_1
Hours_2
Hours_3

The text box I want the totals to show up in is of course:

Hours_4
Nov 1 '10 #1
1 1387
NeoPa
32,556 Expert Mod 16PB
Have you tried setting [Hours_4] to :
Expand|Select|Wrap|Line Numbers
  1. =Nz([Hours_1],0)+Nz([Hours_2],0)+Nz([Hours_3],0)
Nov 1 '10 #2

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