cache reseting problem stumped

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I have an asp.net project with a business layer (project) that has a class
called references. It loads up a data set and stores in cache with the
following code.

_cached = CType(HttpConte xt.Current.Cach e("cached"), String)
If HttpContext.Cur rent.Cache("cac hed") Is Nothing Or _cached <>
"loaded" Then
MyBase.CreateCo mmand("SA_GetRe ferences", _connectionStri ng)
_dsReferences = MyBase.ExecData Set
HttpContext.Cur rent.Cache.Inse rt("dsReference s", _dsReferences,
Nothing, DateTime.Now.Ad dMinutes(60), TimeSpan.Zero)
HttpContext.Cur rent.Cache.Inse rt("cached", "loaded", Nothing,
DateTime.Now.Ad dMinutes(60), TimeSpan.Zero)
End If
_dsReferences = CType(HttpConte xt.Current.Cach e("dsReferences "),
DataSet)

I have a number of properties that checks if in cache and if so returns the
appropriate datatable. If not then it loads up via above method..

Public ReadOnly Property dtLegalEntities () As DataTable
Get
LoadDs()
Return _dsReferences.T ables(9)
End Get
End Property
I also have a shared method to set cache to 'clear' in the few cases when i
want to clear it out.

Public Shared Sub ClearCache()
HttpContext.Cur rent.Cache("cac hed") = "clear"
End Sub

The problem is that for some reason the app error's out complaining that
datatables are not in cache. I dont know how that is possible as with each
reference to the datatable it does the above check. I have made sure that
none of the cached tables are set to nothing.

any ideas on why this is happening? (i have used this technique in other
apps and have not seen this as a problem before).

thx
dave

[KJ]

I suggest you use the overloaded version of Cache.Insert, and specify
a CacheItemPriori ty of AboveNormal. Otherwise, it will be dumped from
the Cache asap. To see if this is what's happening, provide a
CacheItemRemove dCallback delegate parameter as well to Insert.

On Apr 13, 4:02 pm, dave <d...@discussio ns.microsoft.co mwrote:

I have an asp.net project with a business layer (project) that has a class
called references. It loads up a data set and stores in cache with the
following code.

_cached = CType(HttpConte xt.Current.Cach e("cached"), String)
If HttpContext.Cur rent.Cache("cac hed") Is Nothing Or _cached <>
"loaded" Then
MyBase.CreateCo mmand("SA_GetRe ferences", _connectionStri ng)
_dsReferences = MyBase.ExecData Set
HttpContext.Cur rent.Cache.Inse rt("dsReference s", _dsReferences,
Nothing, DateTime.Now.Ad dMinutes(60), TimeSpan.Zero)
HttpContext.Cur rent.Cache.Inse rt("cached", "loaded", Nothing,
DateTime.Now.Ad dMinutes(60), TimeSpan.Zero)
End If
_dsReferences = CType(HttpConte xt.Current.Cach e("dsReferences "),
DataSet)

I have a number of properties that checks if in cache and if so returns the
appropriate datatable. If not then it loads up via above method..

Public ReadOnly Property dtLegalEntities () As DataTable
Get
LoadDs()
Return _dsReferences.T ables(9)
End Get
End Property

I also have a shared method to set cache to 'clear' in the few cases when i
want to clear it out.

Public Shared Sub ClearCache()
HttpContext.Cur rent.Cache("cac hed") = "clear"
End Sub

The problem is that for some reason the app error's out complaining that
datatables are not in cache. I dont know how that is possible as with each
reference to the datatable it does the above check. I have made sure that
none of the cached tables are set to nothing.

any ideas on why this is happening? (i have used this technique in other
apps and have not seen this as a problem before).

thx
dave