How to check if data has been changed in a table control?

Hi,

I have a table control populated with data .

Suppose the user clicks on the back button at the top of the screen after changing some data in the table control , he should get a pop up message asking him whether he wants to cancel the data without saving.

If the user does not change any data in the table control , he should not get this pop-up message .

Please could someone help me out with this.

Regards,

Sushanth H.S.