how to fix height and width of linkbutton when text of linkbutton is empty

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ASP.NET

I have 30 linkbutton in my application.The linkbutton display the value from database.some linkbutoon does not have data or show data because in database does'nt have data. some link button display data . i fixed height and width of every link button.but when page run the linkbutton which contains data has same height and width which i defined but empty link button has not fix height and width the height and width of button is so small according in compare to linkbutton which contains data. i want every linkbutton should have fix height and width wheater they data display or not.

Thanks and Regards
Manohar