How to increment folder number to avoid duplication

BaniXVII asked:

How to increment the folder number if the target number is already in used.
Example I number a folder to IMG0001 but when exported to a directory this folder already exist. Basically the code should increment the folder number to the next available number, like IMG0002 and if this was already in use too the program will increment by one again until the code find a available number to name the folder.
In this way a duplicate folder numbering be avoided.

Thank you very much for any input for my question.

Tags: C# (C# 4.0)

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