Check sqldatasource returned value

Hi,

I have an application where I would like to give access to a page some specific users who have power_user = "Y" in database.now I have created a sql datasource which returns only "Y" or "N" depending on the user who has logged in.Now in the main page there's a button.If the user is a power user and clicks on that button it will redirect him to another page or nothing will happen.In order to achieve it I would like to check if the sql datasource has returned Y or N.Please suggest.
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