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Calculating

Posted on 2002-03-26
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Last Modified: 2010-05-02
I would like to know how i can calculate the total for each product.
i have 4 textboxes that are control arrays

txtUnitPrice(Index)
txtQuantity(Index)
txtDiscount(Index)
txtTotal(Index)

i tried this

txtTotal(Index) = CDbl(txtUnitPrice(Index)) * CDbl(txtQuantity(Index)) / CDbl(txtDiscount(Index))

it doesn't seem to work

where would be the best place to put this code so that the total is
automatically calculated?
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Question by:digitaldestruction66
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2 Comments
 
LVL 22

Accepted Solution

by:
rspahitz earned 200 total points
ID: 6897827
I'd put it into a subroutine that's called by the Change event (or maybe the LostFocus event) of each of the textboxes:

private sub txtUnitPrice_Change(Index as integer)
   UpdateTotal Index
end sub

private sub txtQuantity_Change(Index as integer)
   UpdateTotal Index
end sub

...

private sub UpdateTotal(Index as integer)
  ' note that ".text" was added to each to make it .Net-compliant...it's also good practice
  txtTotal(Index).text = CDbl(txtUnitPrice(Index).text) * CDbl(txtQuantity(Index).text) / CDbl(txtDiscount(Index).text)
end sub
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LVL 5

Expert Comment

by:KarcOrigin
ID: 6898143
Dear digitaldestruction66,

You can put this code in either Change event, LostFocus event or in Validate event of the text box. In the Change event your value will be calculated if you cange anything in the textbox where as in LostFocus event the calculation will be done when the focus is lost from any of the textbox. In case of Validate event, which fires just before the LostFocus event, you can calculate your value too. The difference between LostFocus and Validate event is that in Validate event you can perform some validations and if the entered values are valid then only calculate the value and permit the cursor to move to the next textbox other restrict the cursor to the same textbox by setting the Cancel=True (The LostFocus event does not have the Cancel parameter!!).

I hope this will help you.

Thanks,
KarcOrigin
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