Validation and Error Message Dialog Box

hi,
I created 2 items DateFrom and DateTo.....when User enter dates into these items I need validate these dates i.e DateTo should be greater than DateFrom
if it is not so,,,,I need to Popup a Error message in Dialog Box.........
and this Error should not terminate the Program.
Thanks in Advanced
regards,
Radhika

Radhika,
You need to attach PPR event to the Date To column. In the event code in controller, you can validate do the validation and accordingly throw error on the page.
Why do you need a pop up(javascript alert) for that?
--Mukul

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Images with success and error messages

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Validation and Error Message Dialog Box

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