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Help opening and modifying PDF documents

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roman

Joined: 22 Apr 2008
Posts: 1

Posted: Tue Apr 22, 2008 5:29 am Post subject: Help opening and modifying PDF documents

Hi all.

I am new to using PDFSharp and I'm a little confused on how I can open an existing document and modify the fields in it. Below is the code that I am using:

Code:

string filepath = "C:/Documents and Settings/Administrator/Desktop/PDFsharp/PDFs/BL.pdf";

PdfDocument doc1 = new PdfDocument("Bill Of Lading instructions");

doc1 = PdfReader.Open(filepath, PdfDocumentOpenMode.Modify);

PdfPage page1 = doc1.AddPage();
PdfAcroForm acroForm = doc1.AcroForm;
PdfAcroField.PdfAcroFieldCollection fields = acroForm.Fields;

However, the last line "PdfAcroField.PdfAcroFieldCollection" returns NullReferenceException: Object reference not set to an instance of an object. I was wondering if anyone could please help me out with my issue?

Best regards,

Roman

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