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    <p>According to the documentation of the <a href="http://msdn.microsoft.com/en-us/library/system.io.filesystemwatcher.aspx" rel="nofollow"><code>System.IO.FileSystemWatcher</code></a> class:</p> <blockquote> <p>The Windows operating system notifies your component of file changes in a buffer created by the FileSystemWatcher. If there are many changes in a short time, the buffer can overflow. This causes the component to lose track of changes in the directory, and it will only provide blanket notification. Increasing the size of the buffer with the InternalBufferSize property is expensive, as it comes from non-paged memory that cannot be swapped out to disk, so keep the buffer as small yet large enough to not miss any file change events. To avoid a buffer overflow, use the NotifyFilter and IncludeSubdirectories properties so you can filter out unwanted change notifications.</p> </blockquote> <p>It might be that the event isn't being consumed fast enough and the internal buffer isn't large enough to handle all the notifications. By default, the watcher handles <code>FileName</code>, <code>DirectoryName</code>, <code>LastWrite</code> notifications yet you only consume creation events (both file and directory). Are your applications running in quick succession? I'd try putting a delay between the invocations of your applications (instead of the event handler), use more specific filters (just the <code>FileName</code> notification or watch only for log files using the <code>Filter</code> property), increase the internal buffer size or any combination of the above. I think that should fix your problem.</p>
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    1. POFileSystemWatcher - event not firing the second time
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    1. USJeff Mercado
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      1. VTUpMod
    1. COThe other applications are not running in quick succession. I can wait a few seconds or a few minutes between launching different applications with the same results.
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      1. UScwo
    2. CO@cwo: Then you might be able to get away with leaving out the delays if you tried the other things I've mentioned.
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