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How to have a particular processing to occur on selected number of records?



I have a scenario where i have to display all the records of products in a page and user can select any number of rows. After the selection of records(products), sum of all the selected product prices is to be calculated . Can anyone suggest me how to do this?


I know how to do data updation on selected number of rows, but calculating the sum, i need some suggestions in this regard...