how to debug the program after execution

I phased this Quetion in interview.

I have 3000 line 's of code but after execution of the program i am getting result

"there are no components " how to handle the situation.

I answerd : first i will execute the program in another client and i will check the result if it is same i will put breakpoint at where the statement triggered "there are no data contents " in my program and i will check for data in database tables.

is it corrct there is any another answer