Defines a callback method for notifying applications after a request for asynchronous add operation completes.

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


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


Type: System..::..String
The cache key used to reference the item.
Type: System..::..Object
The result of the Async Operation. If the operation completes successfully, it contatins Success otherwise it contains an OperationFailedException indicating the cause of operation failure.


Since this handler is invoked every time an item is added to 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 AsyncItemAddedCallback class to notifiy an application when a request for asynchronous add operation completes. Client applications recieve the notification if the operation is successful or not. You could include this code in a code declaration block in the Web Forms page, or in a page code-behind file.
public void OnAsyncItemAdded(string key, object result)
    // ...

protected void Application_Start(object sender, EventArgs e)
     CacheItem item = new CacheItem("value");
     item.AsyncItemAddCallback = new AsyncItemAddCallback(OnAsyncItemAdded);
        NCache.Cache.AddAsync("key", item);
    catch(Exception e)

See Also