iTextSharp.text.pdf.AcroFields.IsInAP C# (CSharp) Method

        internal bool IsInAP(PdfDictionary dic, PdfName check) {
            PdfDictionary appDic = dic.GetAsDict(PdfName.AP);
            if (appDic == null)
                return false;
            PdfDictionary NDic = appDic.GetAsDict(PdfName.N);
            return (NDic != null && NDic.Get(check) != null);
        }