''' <summary>
''' Returns the number of pages in PDF document.
''' </summary>
''' <param name="pdfFileName">The filename of PDF document.</param>
Public Shared Function GetPagesCount(pdfFileName As String) As Integer
    ' open PDF document
    Using document As New Vintasoft.Imaging.Pdf.PdfDocument(pdfFileName)
        ' get the number of pages
        Dim pagesCount As Integer = document.Pages.Count

        ' return number of pages
        Return pagesCount
    End Using
End Function

/// <summary>
/// Returns the number of pages in PDF document.
/// </summary>
/// <param name="pdfFileName">The filename of PDF document.</param>
public static int GetPagesCount(string pdfFileName)
{
    // open PDF document
    using (Vintasoft.Imaging.Pdf.PdfDocument document = 
        new Vintasoft.Imaging.Pdf.PdfDocument(pdfFileName))
    {
        // get the number of pages
        int pagesCount = document.Pages.Count;
        
        // return number of pages
        return pagesCount;
    }
}