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CacheItemRemovedCallback does not update Cache object properly

Hi,
I have used Asp.net ,Vb.net (1.1)
I am not able to refresh my cache object every 10 sec
It happens only if I refresh the page
And it does not call automatically after 10 sec.

--------------Code--In ---Global.asax----------------
Sub Application_Start(ByVal sender As Object, ByVal e As EventArgs)

Dim onRemove As CacheItemRemovedCallback = New CacheItemRemovedCallback(AddressOf RefreshCache)
RefreshCache("Employees", Nothing, CacheItemRemovedReason.Expired)

End Sub

Shared Sub RefreshCache(ByVal key As String, ByVal item As Object, ByVal reason As System.Web.Caching.CacheItemRemovedReason)

Dim adapter As SqlDataAdapter = New SqlDataAdapter("SELECT EmployeeID, lastname, firstname FROM Employees", "Data Source=................connection String.......................")
Dim con As New SqlClient.SqlConnection
Dim ds As New DataSet
adapter.Fill(ds, "Employees")
Dim onRemove As CacheItemRemovedCallback = New CacheItemRemovedCallback(AddressOf RefreshCache)

System.Web.HttpContext.Current.Cache.Remove("Employees")
HttpContext.Current.Cache.Add("Employees", ds, Nothing, Date.Now.AddSeconds(10), TimeSpan.Zero, CacheItemPriority.High, onRemove)
End Sub

-------End of Code-----------
Thanks & Regards

ASKER CERTIFIED SOLUTION

Bob Learned

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SystemExpert

ASKER

Bob,

I just add it because I can call it from my .aspx page for Testing purpose

later on I will put this method in Data Layer

That's not the problem

Thanks

Bob Learned

Try this on for size:

ASP.NET Crash: Bad CacheItemRemovedCallback - Part II
http://blogs.msdn.com/tess/archive/2006/11/27/asp-net-crash-bad-cacheitemremovedcallback-part-ii.aspx

<Quote>The morale of the story is, don't use the CacheItemRemovedCallback to add a new copy of the same cache item. Instead use sliding expiration, and instead add the cached item when you try to access the cached item and this item is null.</Quote>

Bob

SystemExpert

ASKER

Thanks Bob

Last I used Thredpool

Thanks

Bob Learned

Did that work?

Bob