Remove pages from PDFs in C#

using GdPicturePDF gdpicturePDF = new GdPicturePDF();
gdpicturePDF.LoadFromFile(@"C:\temp\source.pdf");
// Remove second-to-last page.
gdpicturePDF.DeletePage(gdpicturePDF.GetPageCount() - 1);
gdpicturePDF.SaveToFile(@"C:\temp\output.pdf");

Using gdpicturePDF As GdPicturePDF = New GdPicturePDF()
    gdpicturePDF.LoadFromFile("C:\temp\source.pdf")
    ' Remove second-to-last page.
    gdpicturePDF.DeletePage(gdpicturePDF.GetPageCount() - 1)
    gdpicturePDF.SaveToFile("C:\temp\output.pdf")
End Using

GdPictureImaging gdpictureImage = new GdPictureImaging();
int imageID = gdpictureImage.TiffCreateMultiPageFromFile(@"C:\temp\source.tif");
// Remove first page.
gdpictureImage.TiffDeletePage(imageID, 1);
gdpictureImage.TiffSaveMultiPageToFile(imageID, @"C:\temp\output.tif",
    TiffCompression.TiffCompressionAUTO);
gdpictureImage.ReleaseGdPictureImage(imageID);

Using gdpictureImage As GdPictureImaging = New GdPictureImaging()
    Dim imageID As Integer = gdpictureImage.TiffCreateMultiPageFromFile("C:\temp\source.tif")
    ' Remove first page.
    gdpictureImage.TiffDeletePage(imageID, 1)
    gdpictureImage.TiffSaveMultiPageToFile(imageID, "C:\temp\output.tif",
        TiffCompression.TiffCompressionAUTO)
    gdpictureImage.ReleaseGdPictureImage(imageID)
End Using