Check - Uncheck all Checkboxes in Grid

Dears,

I have form with grid, the grid is filling from datasource, I have added a checkbox field into grid row. There is another checkbox in the form with label select all. I want if the select all checkbox is checked then all the checkboxes with grid rows must be checked, if select all is unchecked then all the grid associated checkboxes must be unchecked. 

How should I do this?

Thanks.