internal static extern bool CertSetCertificateContextProperty(IntPtr pCertContext, CertPropertyId dwPropId, int dwFlags, IntPtr pvData);
internal static extern bool CertGetCertificateContextProperty(IntPtr pCertContext, CertPropertyId dwPropId, IntPtr pvData, ref int pcbData);
bool CertSetCertificateContextProperty(IntPtr pCertContext, CertPropertyId dwPropId, DWORD dwFlags, IntPtr pvData);