DATEDIFF Function Dosen't Return Anything If Used Inside ASPX Page!!

Dear all, I have the Following Query:
SELECT DATEDIFF(day, GETDATE(), RECENT_RESERVATION)AS Expr1,RECENT_RESERVATION FROM EMP WHERE SUN=empName;
when i run it inside the query analyzer, it returns two columns. but if run it inside The ASPX page it retuns only one column wich is  RECENT_RESERVATION date.
Note: i am using one methode that takes care of reading from SQL and assigning the result into an array, it works fine everywhere, but with this query it dosen't work.
 
Any suggestions??