protected unsafe void EnableActionSourceCount()
        {
            iCallbackSourceCount = new CallbackSourceCount(DoSourceCount);
            IntPtr ptr = GCHandle.ToIntPtr(iGch);

            DvServiceLinnCoUkProduct3EnableActionSourceCount(iHandle, iCallbackSourceCount, ptr);
        }
 static extern void DvServiceLinnCoUkProduct3EnableActionSourceCount(uint aHandle, CallbackSourceCount aCallback, IntPtr aPtr);