Hi,

I have small web app that generate PDF files as a report. I'm trying to delete those generated PDF files after 10 sec that they are generated. What I want to do is to read a folder with PDF files every 10 sec, and delete all the PDF files inside that folder.

I read this post of Easy Background Tasks in ASP.NET. The following code is the VB version.

    Protected Sub Application_Start(ByVal sender As Object, ByVal e As EventArgs)
    AddTask("DoStuff", 10)
End Sub

Private Sub AddTask(ByVal name As String, ByVal seconds As Integer)
    OnCacheRemove = New CacheItemRemovedCallback(CacheItemRemoved)
    HttpRuntime.Cache.Insert(name, seconds, Nothing, DateTime.Now.AddSeconds(seconds), Cache.NoSlidingExpiration, CacheItemPriority.NotRemovable, _
     OnCacheRemove)
End Sub

Public Sub CacheItemRemoved(ByVal k As String, ByVal v As Object, ByVal r As CacheItemRemovedReason)
    ' do stuff here if it matches our taskname, like WebRequest

    DeletePDFilesInFoler()

    ' re-add our task so it recurs
AddTask(k, Convert.ToInt32(v))

End Sub

But I got this error

Delegate 'System.Web.Caching.CacheItemRemovedCallback' requires an 'AddressOf' expression or lambda expression as the only argument to its constructor.

If this code works, where I should put it. Right, now I'm putting it in the master page. How to get this error out?

Thank you