Test to see if a file exists or is empty

The code below always tells me the file does not exists... I can't seem to tell what is wrong?  

if (-s $DirPath.$FileName_loc){
open(INFILE, $DirPath.$FileName_loc);
print "File $DirPath.$FileName_loc exists.\n";
print "File $DirPath$FileName_loc doesn't exist or empty\n";
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Place the dir/name in quotes line this:

if (-s "$DirPath$FileName_loc")

or this:

if (-s "$DirPath/$FileName_loc")

depending on if the variables end/start with a slash or not...

If your on Unix most OSs will let you put in an extra / (ex:  /usr//bin) and not complain... windows is not so forgiving...

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is the same as
Does your print statement report the correct filename?

You could also check the open:
open(INFILE, "<$DirPath/$FileName_loc" ) or die "can't open $DirPath/$FileName_loc because $!";
to return an error message if the file does not exist.
ozo while your right about the twqo forms of concatenation I have found that these file operators seem to want quotes and no bare path/filenames.  At least thats what I've found...
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