Is there a way to call a function when the cache expires due to time expiration or table-based dependency when using SysCache2 and SQL Server 2005. I would like to to use this callback to trigger an ajax page refresh and display the latest information coming from the database. Any help would be greatly appreciated.

Thanking you in advance
Francis

HTTP request is one-way -- from client to server. Therefore, it does not matter what one does on the server-side, it cannot trigger something to happen on the client-side. In other words, the server cannot respond to something that has not been requested.

Thanks for answering. Since SysCache2 is built on top of the System.Web.Caching.Cache class, that class has the following member function.

public Object Add (
string key,
Object value,
CacheDependency dependencies,
DateTime absoluteExpiration,
TimeSpan slidingExpiration,
CacheItemPriority priority,
CacheItemRemovedCallback onRemoveCallback
)

I just want to be able to set the onRemoveCallback parameter using SysCache2. Is that possible? Any feedback would be greatly appreciated.

Thanking you in advance
Francis

As far as I can tell, SysCache2 does not propagate the callback out. In other words, SysCache2 only uses the onRemoveCallback parameter internally and does not raise any event that user code can use. Someone who is more familiar with the SysCache2 implementation may be in a better position to comment more on this than I can.