Example: Calculating a total

- [Instructor] When were working with repeaters…there will be time when we'll want to add a running total…for one of our columns of data.…Maybe we've got a shopping cart page like this one…where we want to be able to add items to a cart…and then show a total in a shopping cart somewhere.…Or it might be a data table where we need to total up…one of the columns and then display…that somewhere else on our interface.…We can actually make the repeater do that work…of totalling up values for us while it's loading up items.…And what we'll do now is total up the amount…of all of the open invoices in this repeater…and then show that total up at top of the page…where it says, outstanding balance.…

What we'll be doing here is that…when the repeater first starts loading up items…when it's loading up this first item here…we'll set a variable to zero then…for each of the open invoices as the repeater is loading up…that item we'll have the repeater add…that amount to our variable.…Then when we get to the last item,…that's when we'll show the total…