Opc.Ua.WindowsCertificateStore.FindByThumbprint C# (CSharp) Method

        public X509Certificate2 FindByThumbprint(string thumbprint)
        {
            lock (m_lock)
            {
                IntPtr hStore = IntPtr.Zero;
                IntPtr pCertContext = IntPtr.Zero;   
                IntPtr pDupCertContext = IntPtr.Zero;

	            // find the certificate.
	            try
                {
                    // open store.
                    hStore = OpenStore(true, false, false);

                    if (hStore == IntPtr.Zero)
                    {
                        return null;
                    }

                    // find existing certificate.
                    pCertContext = FindCertificate(hStore, thumbprint);

                    if (pCertContext == IntPtr.Zero)
                    {
                        return null;
                    }

                    // duplicate the certificate context.
                    pDupCertContext = NativeMethods.CertDuplicateCertificateContext(pCertContext);

                    if (pDupCertContext == IntPtr.Zero)
                    {
                        int dwError = Marshal.GetLastWin32Error();

                        throw ServiceResultException.Create(
                            StatusCodes.BadUnexpectedError,
                            "Could not duplicate the certificate context. Error={0:X8}",
                            dwError);
                    }

                    // create the certificate.
                    X509Certificate2 certificate = new X509Certificate2(pDupCertContext);
                    return certificate;
	            }
	            finally
                {
                    if (pCertContext != IntPtr.Zero)
                    {
                        NativeMethods.CertFreeCertificateContext(pCertContext);
                    }

                    if (pDupCertContext != IntPtr.Zero)
                    {
                        NativeMethods.CertFreeCertificateContext(pDupCertContext);
                    }
                    
                    if (hStore != IntPtr.Zero)
                    {
                        NativeMethods.CertCloseStore(hStore, 0);
                    }
	            }
            }
        }