if you do something like :-
System.Windows.Forms.Application.ExecutablePath.ToString()
iirc, you get the full path/name of the exe - in your case if the program was 'program.exe' that should be
...\bin\debug\program.exe
so if you strip off the 'program.exe', and combine whats left with 'books' that would be the correct folder
(where ... may represent C:\path\)
'g'