//// This code is part of Document Solutions for PDF .NET demos.// Copyright (c) MESCIUS inc. All rights reserved.//using System.IO;using GrapeCity.Documents.Pdf;using GrapeCity.Documents.Pdf.AcroForms;
namespace DsPdfWeb.Demos{    // This sample shows how to find and remove signature fields from a PDF.    // The code in this sample is almost identical to the code in RemoveSignatures,    // which also finds all signature fields, but removes just the signatures,    // leaving the fields.    // The PDF used in this sample was created by TimeSheet.    public class RemoveSignatureFields    {        public int CreatePDF(Stream stream)        {            var doc = new GcPdfDocument();            using (var fs = File.OpenRead(Path.Combine("Resources", "PDFs", "TimeSheet.pdf")))            {                doc.Load(fs);
                // Fields can be children of other fields, so we use                // a recursive method to iterate through the whole tree:                removeSignatureFields(doc.AcroForm.Fields);
                // Done:                doc.Save(stream);                return doc.Pages.Count;
                void removeSignatureFields(FieldCollection fields)                {                    for (int i = fields.Count - 1; i >= 0; --i)                    {                        removeSignatureFields(fields[i].Children);                        // Note: if we just wanted to remove the signature                        // without removing the field itself, we would do:                        // ((SignatureField)fields[i]).Value = null;                        if (fields[i] is SignatureField)                            fields.RemoveAt(i);                    }                }            }        }    }}