iTextSharp.text.pdf.PdfSignatureAppearance.GetNewSigName C# (CSharp) Метод

        public String GetNewSigName()
        {
            AcroFields af = writer.AcroFields;
            String name = "Signature";
            int step = 0;
            bool found = false;
            while (!found) {
                ++step;
                String n1 = name + step;
                if (af.GetFieldItem(n1) != null)
                    continue;
                n1 += ".";
                found = true;
                foreach (String fn in af.Fields.Keys) {
                    if (fn.StartsWith(n1)) {
                        found = false;
                        break;
                    }
                }
            }
            name += step;
            return name;
        }