Mandatory Prompt not working in crystal report

Hi,

I do know that there is a option to make the prompt mandatory in the prompt selection window by making "Optional Prompt:False" in crystal 2011.If this is the case then report should not run when values are not entered and OK button is clicked in the prompt screen.But sill the reports runs but gives no data.

The report should not run when prompt is not entered.Is there a way to achieve this?