Help with FileSystemWatcher

[Nathan Sokalski]

I have a directory on my site that I keep a bunch of text files in. The
Application keeps the first line of each of these files in an
HttpApplicationState variable as a SortedList. When I add or modify one of
the files in this directory, I want to delete this HttpApplicationState
variable. I tried to do this using the following lines of code in
Global.asax.vb:

Private WithEvents poemfilewatcher As New
IO.FileSystemWatcher(HttpContext.Current.Server.MapPath("/poetry/poems/"))


Private Sub PoemDirModified(ByVal sender As Object, ByVal e As
System.IO.FileSystemEventArgs) Handles poemfilewatcher.Changed,
poemfilewatcher.Created, poemfilewatcher.Deleted

HttpContext.Current.Application.Lock()

HttpContext.Current.Application.Remove("poemlist")

HttpContext.Current.Application.UnLock()

End Sub


Sub Application_Start(ByVal sender As Object, ByVal e As EventArgs)

poemfilewatcher.IncludeSubdirectories = True

poemfilewatcher.EnableRaisingEvents = True



End Sub


However, when I add, delete, or modify a file in the directory it does seem
to delete the HttpApplicationState variable. Am I forgetting to do
something? Am I doing something wrong? Any help would be appreciated, or
possibly an example. Thanks.