private void TestParam()
        {
            int    hr;
            int    p1;
            IntPtr p2 = IntPtr.Zero;

            hr = m_asfw.GetParam(ASFWriterConfig.MultiPass, out p1, p2);
            DsError.ThrowExceptionForHR(hr);

            Debug.Assert(p1 == 0, "GetParam");

            hr = m_asfw.SetParam(ASFWriterConfig.MultiPass, 1, 0);
            DsError.ThrowExceptionForHR(hr);

            hr = m_asfw.GetParam(ASFWriterConfig.MultiPass, out p1, p2);
            DsError.ThrowExceptionForHR(hr);

            Debug.Assert(p1 == 1, "SetParam");
        }