How to update multiple objects in a collection on a single click

I have a check box in a grid of 3 columns. which displays list of students through list service which runs on load of the page.
Now i have to select the check box for the students who are present in the class and then on click of submit button its value should be updated in to the database.
in short how will i run update service to updated multiple object on a single click of a button.
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