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