VintaSoft Imaging .NET SDK v8.7
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    PDF: How to split PDF document?
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    Here is an example that demonstrates how to split PDF document to several PDF documents:

    ' The project, which uses this code, must have references to the following assemblies:
    ' - Vintasoft.Imaging.Pdf
    
    Public Shared Sub SplitPDFDocuments(sourceDocumentFilename As String, ParamArray resultDocumentsFilenames As String())
        If resultDocumentsFilenames.Length = 0 Then
            Return
        End If
        ' open source document
        Dim sourceDocument As New Vintasoft.Imaging.Pdf.PdfDocument(sourceDocumentFilename)
        ' create result documents array
        Dim resultDocumentsLength As Integer = System.Math.Min(resultDocumentsFilenames.Length, sourceDocument.Pages.Count)
        Dim resultDocuments As Vintasoft.Imaging.Pdf.PdfDocument() = New Vintasoft.Imaging.Pdf.PdfDocument(resultDocumentsLength - 1) {}
        For i As Integer = 0 To resultDocuments.Length - 1
            ' create result document v1.4
            resultDocuments(i) = New Vintasoft.Imaging.Pdf.PdfDocument(resultDocumentsFilenames(i), System.IO.FileMode.Create, Vintasoft.Imaging.Pdf.PdfFormat.Pdf_14)
        Next
    
        ' split source document
        Dim currenPageIndex As Integer = 0
        Dim totalPages As Integer = sourceDocument.Pages.Count
        While currenPageIndex < totalPages
            For i As Integer = 0 To resultDocuments.Length - 1
                resultDocuments(i).Pages.Add(sourceDocument.Pages(currenPageIndex))
                currenPageIndex += 1
                If currenPageIndex >= totalPages Then
                    Exit For
                End If
            Next
        End While
    
        For i As Integer = 0 To resultDocuments.Length - 1
            ' save changes
            resultDocuments(i).SaveChanges()
            ' close result document
            resultDocuments(i).Dispose()
        Next
        ' close source document
        sourceDocument.Dispose()
    End Sub
                  
    
    // The project, which uses this code, must have references to the following assemblies:
    // - Vintasoft.Imaging.Pdf
    
    public static void SplitPDFDocuments(string sourceDocumentFilename, params string[] resultDocumentsFilenames)
    {
        if (resultDocumentsFilenames.Length == 0)
            return;
        // open source document
        Vintasoft.Imaging.Pdf.PdfDocument sourceDocument = 
            new Vintasoft.Imaging.Pdf.PdfDocument(sourceDocumentFilename);
        // create result documents array
        int resultDocumentsLength = System.Math.Min(resultDocumentsFilenames.Length, sourceDocument.Pages.Count);
        Vintasoft.Imaging.Pdf.PdfDocument[] resultDocuments = 
            new Vintasoft.Imaging.Pdf.PdfDocument[resultDocumentsLength];
        for (int i = 0; i < resultDocuments.Length; i++)
            // create result document v1.4
            resultDocuments[i] = new Vintasoft.Imaging.Pdf.PdfDocument(
                resultDocumentsFilenames[i], System.IO.FileMode.Create, Vintasoft.Imaging.Pdf.PdfFormat.Pdf_14);
    
        // split source document
        int currenPageIndex = 0;
        int totalPages = sourceDocument.Pages.Count;
        while (currenPageIndex < totalPages)
        {
            for (int i = 0; i < resultDocuments.Length; i++)
            {
                resultDocuments[i].Pages.Add(sourceDocument.Pages[currenPageIndex]);
                currenPageIndex++;
                if (currenPageIndex >= totalPages)
                    break;
            }
        }
    
        for (int i = 0; i < resultDocuments.Length; i++)
        {
            // save changes
            resultDocuments[i].SaveChanges();
            // close result document
            resultDocuments[i].Dispose();
        }
        // close source document
        sourceDocument.Dispose();
    }