Initiates the asynchronous execution of the UpdateItem operation.
            
 Declaration Syntax
 Declaration Syntax| C# | 
public IAsyncResult BeginUpdateItem( Document doc, Primitive hashKey, AsyncCallback callback, Object state )
 Parameters
 Parameters- doc (Document)
- Attributes to update.
- hashKey (Primitive)
- Hash key element of the document.
- callback (AsyncCallback)
- An AsyncCallback delegate that is invoked when the operation completes.
- state (Object)
- A user-defined state object that is passed to the callback procedure. Retrieve this object from within the callback procedure using the AsyncState property.
 Return Value
 Return ValueAn IAsyncResult that can be used to poll or wait for results, or both; this value is also needed when invoking EndUpdateItem
                    operation.
 See Also
 See Also