Determine number of files in a dynamic directory

Hello everyone,

I don't know if I ask too much, but is it possible if I have a directory like the following

Please Login or Register  to view this content.

with .csv files which are placed in arithmetic order 01,02,03 etc to determine if one .csv file is missing and print an error that this file is missing? I think that if I knew how many files I got I would create an array and check one by one the files.. But in case I have a dynamic directory and the number of files is not the same all the time , is this possible?

Thank you in advance,
Desolatori

Thank you for the reply but I don't really get it.. This will print the total number of files which are in the folder right? How shall I use the i counter in order to realize that a file is missing.