Defines a callback method for notifying applications when a request for asynchronous insert operation completes.

Namespace: Alachisoft.NCache.Web.Caching
Assembly: Alachisoft.NCache.Web (in Alachisoft.NCache.Web.dll) Version: (


public delegate void AsyncItemUpdatedCallback(
	string key,
	Object result
Visual Basic
Public Delegate Sub AsyncItemUpdatedCallback ( _
	key As String, _
	result As Object _
Visual C++
public delegate void AsyncItemUpdatedCallback(
	String^ key, 
	Object^ result


Type: System..::..String
The cache key used to reference the item.
Type: System..::..Object
It indicates the result of the async operation. If the operation completes successfully, the result contains Success otherwise it contains an OperationFailedException describing the cause of the operation failure.


Since this handler is invoked every time an item is removed from the Cache, doing a lot of processing inside the handler might have an impact on the performance of the cache and cluster. It is therefore advisable to do minimal processing inside the handler.


The following example demonstrates how to use the AsyncItemUpdatedCallback class to notifiy an application when an item is asynchronously updated in the Cache object. You could include this code in a code declaration block in the Web Forms page, or in a page code-behind file.
public void OnAsyncItemUpdated(string key, object result)
    // ...

protected void Application_Start(object sender, EventArgs e)
     CacheItem item = new CacheItem("value");
     item.AsyncItemUpdateCallback = new AsyncItemUpdateCallback(OnAsyncItemUpdated);
        NCache.Cache.InsertAsync("key", item);
    catch(Exception e)

See Also