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    <p>Well it depends on a lot of things.</p> <p>The main issue is going to be one of efficiency.</p> <p>The file system watcher <a href="http://msdn.microsoft.com/en-us/library/system.io.filesystemwatcher.aspx" rel="nofollow">MSDN HERE</a> will get you the events of the files being created, but then you will have to deal with all of the <em>potential</em> scenarios, like someone putting in files another type in the directory, multiple files at once, etc.</p> <p>If I were designing such a thing I would consider a multithreaded app and some queueing.</p> <p>Part#2...</p> <p>It will not modify the integer, it will notify you when the files are created / deleted etc. Keeping count of those events will allow you to keep track of the files themselves. Persisting the setting would require something external to the running application such as a registry key or disk file. By queuing events from the file system watcher, you can control access to that persisted file in a clean organized manner ensuring that it always corresponds to the operation at hand, not just a file creation or deletion event.</p> <p>Essentially every time the app loads get the last value from the file, as an operation process increment / decrement the value that is in memory and write it back out to that file. The value would be an integer in memory and simply incremented or decremented with a ++ or – as detailed <a href="http://msdn.microsoft.com/en-us/library/dy3d35h8%28v=VS.100%29.aspx" rel="nofollow">here</a> </p>
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    1. POHow do I increment the number in a file I create each time a new file is create?
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    1. POHow do I increment the number in a file I create each time a new file is create?
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    1. COIt seems a little eager to suggest the OP should `consider a multithreaded app and some queueing` without more details of what they're trying to accomplish.
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      1. USJim D'Angelo
    2. COI have edited the original question to better reflect the purpose of the app.
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      1. USTyrel Denison
    3. COSeems completely reasonable when you consider what could happen. By using a multithreaded queue the program can do things like account for files being added in bulk, removed while others are still processing, provide user feedback while operations are in progress (pending operations vs current), one operation has write access to the file locked when another tries to update it, the list goes on. The question comes down to do you want a solution or a fix. Writing an application that covers the bases from the start saves time and coding costs.
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