Microsoft.Xades.XadesSignedXml.CheckQualifyingProperties C# (CSharp) Method

        public virtual bool CheckQualifyingProperties()
        {
            XmlElement signatureElement;
            XmlNamespaceManager xmlNamespaceManager;
            XmlNodeList xmlNodeList;

            signatureElement = this.GetXml();
            xmlNamespaceManager = new XmlNamespaceManager(signatureElement.OwnerDocument.NameTable);
            xmlNamespaceManager.AddNamespace("ds", SignedXml.XmlDsigNamespaceUrl);
            xmlNamespaceManager.AddNamespace("xsd", XadesSignedXml.XadesNamespaceUri);
            xmlNodeList = signatureElement.SelectNodes("ds:Object/xsd:QualifyingProperties", xmlNamespaceManager);
            if (xmlNodeList.Count > 1)
            {
                throw new CryptographicException("More than one Object contains a QualifyingProperties element");
            }

            return true;
        }