how can I get the Shutter event for my Camera?

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Windows

Win7

hi,
I read your artile from Transferring D90 images with WIA[^], and my Camera is D90,too. with your program, i can scan image from camera and transfer to my PC.

The event you given in the program, i change a little as the following,i want the WIA.EventID.wiaEventItemCreated,

public void devManager_OnEvent( string eventID, string deviceID, string itemID )
       {
           switch (eventID)
           {
               case WIA.EventID.wiaEventDeviceConnected:
                    {
                        //OK
                        //when open the camera
                    }
                    break;
                case WIA.EventID.wiaEventDeviceDisconnected:
                    {
                        //OK
                        //when close the camera
                    }
                    break;
                case WIA.EventID.wiaEventItemCreated:
                    {
                        //how can i get it ??
                    }
                    break;
               case WIA.EventID.wiaEventItemDeleted:
                   {
                   }
                   break;
               case WIA.EventID.wiaEventScanEmailImage:
                   {
                   }
                   break;
               case WIA.EventID.wiaEventScanFaxImage:
                   {
                   }
                   break;
               default :
                   break;
           }


       }

or,there are some shutter event, for example when pressing the shutter, triggering the event??

my english is not well,i hope you can understand me,my email is :[removed email],you can send email to me if you can solve it,thank you a lot!