Public Function Add( _
    ByVal inputBackOff As Double, _
    ByVal outputBackOff As Double _
) As 

public IAgTransferFunctionInputBackOffOutputBackOffTableRow Add(
    double inputBackOff,
    double outputBackOff
);

public: IAgTransferFunctionInputBackOffOutputBackOffTableRow^ Add(
    double inputBackOff,
    double outputBackOff
);

public IAgTransferFunctionInputBackOffOutputBackOffTableRow add(
    double inputBackOff,
    double outputBackOff
);

public: HRESULT Add(
    double inputBackOff,
    double outputBackOff,
    IAgTransferFunctionInputBackOffOutputBackOffTableRow ** ppRetVal
);