Help pls.Forms validation with file upload

[eluser]treenef[/eluser]
What I do in my controller is check if file is uploaded first then do a form validation on the data fields so...

Code:

if form upload == true
{
    form input filed check() == true()
   {
    return success
   }
   else
  {
     return fail
   }
}
else
{
return fail
}