Convert a multipage TIFF to a multipage JBIG2 in C#

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//We assume that GdPicture has been correctly installed and unlocked.
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string tifffilepath = "multipage.tif";
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string jb2filepath = "multipage.jb2";
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using (GdPictureImaging oGdPictureImaging = new GdPictureImaging())
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{
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   int TiffID = oGdPictureImaging.CreateGdPictureImageFromFile(tifffilepath);
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   if (oGdPictureImaging.GetStat() == GdPictureStatus.OK)
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   {
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    int Jbig2ID = 0;
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    int pageCount = oGdPictureImaging.TiffGetPageCount(TiffID);
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    for (int i = 1; i <= pageCount; i++)
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    {
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     if (i == 1)
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     {
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      Jbig2ID = oGdPictureImaging.CreateClonedGdPictureImage(TiffID);
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      if ((oGdPictureImaging.GetStat() != GdPictureStatus.OK) ||
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        (oGdPictureImaging.JBIG2SaveAsMultiPageFile(Jbig2ID, jb2filepath) != GdPictureStatus.OK))
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      {
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         MessageBox.Show("Error: " + oGdPictureImaging.GetStat().ToString(), "TIFF to JBIG2 Example", MessageBoxButtons.OK, MessageBoxIcon.Error);
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         break;
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      }
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     }
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     else
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     {
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      if ((oGdPictureImaging.TiffSelectPage(TiffID, i) != GdPictureStatus.OK) ||
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        (oGdPictureImaging.JBIG2AddToMultiPageFile(Jbig2ID, TiffID) != GdPictureStatus.OK))
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      {
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         MessageBox.Show("Error: " + oGdPictureImaging.GetStat().ToString(), "TIFF to JBIG2 Example", MessageBoxButtons.OK, MessageBoxIcon.Error);
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         break;
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      }
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     }
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    }
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    if (oGdPictureImaging.GetStat() == GdPictureStatus.OK)
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     MessageBox.Show("Done!", "TIFF to JBIG2 Example", MessageBoxButtons.OK, MessageBoxIcon.Information);
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    oGdPictureImaging.JBIG2CloseMultiPageFile(Jbig2ID);
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    oGdPictureImaging.ReleaseGdPictureImage(Jbig2ID);
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    oGdPictureImaging.ReleaseGdPictureImage(TiffID);
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   }
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   else
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    MessageBox.Show("Error: " + oGdPictureImaging.GetStat().ToString(), "TIFF to JBIG2 Example", MessageBoxButtons.OK, MessageBoxIcon.Error);
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}