protected unsafe void EnableActionNext()
        {
            iCallbackNext = new CallbackNext(DoNext);
            IntPtr ptr = GCHandle.ToIntPtr(iGch);

            DvServiceUpnpOrgAVTransport2EnableActionNext(iHandle, iCallbackNext, ptr);
        }
 static extern void DvServiceUpnpOrgAVTransport2EnableActionNext(uint aHandle, CallbackNext aCallback, IntPtr aPtr);