var _fillForms = new PdfForms();
            using (var _doc = Patagames.Pdf.Net.PdfDocument.Load("c:\temp.pdf", _fillForms))
            {
                var interactiveForms = _doc.FormFill.InterForm;
                foreach (var field in interactiveForms.Fields)
                {
                    try
                    {
                        if (field.FieldType == Patagames.Pdf.Enums.FormFieldTypes.FPDF_FORMFIELD_TEXTFIELD)
                        {
                            field.Value = "TextField populated";
                        }
                        else if (field.FieldType == Patagames.Pdf.Enums.FormFieldTypes.FPDF_FORMFIELD_LISTBOX)
                        {
                            string val;
                            // need to populate the listbox with valid Currency types i.e. US Dollars, British Pounds, Euro etc.
                            field.Value = ??


                        }
                    }
                    catch (Exception ex)
                    {
                        //Log ("Problem populating PDF ",ex);
                    }
                }

                _doc.Save("C:\temp.pdf", Patagames.Pdf.Enums.SaveFlags.NoIncremental);
                _doc.Dispose();
            }
        }