how to run executable files on mini2440

Hi,
  As we see some of the simple example of mini2440 which are there in cd.
  Also I saw some program executable files in usr/bin of above program
which I run using ./file command it work properly.
   I had ubantu 10.10 ver linux os installed in pc.
   I took .c files of examples in cd and compile it in linux gcc compiler
in my system, I got executable file in system. Then I transfer these files
to usr/bin of kit using serial port.
   I check it in directory.Then I am trying to run these files using ./file
command but it shows message Permission denied.
  Please suggest what I suppose to do?

You should start by reading how Linux manages execution permissions (read
the manual page of the 'chmod' command for example)

Did you compile with the ARM9 set as the target? Or compile for your PC?