Opc.Ua.Client.Session.Initialize C# (CSharp) Method

        private void Initialize(
            ITransportChannel        channel, 
            ApplicationConfiguration configuration, 
            ConfiguredEndpoint       endpoint,
            X509Certificate2         clientCertificate)
        {
            Initialize();

            // save configuration information.
            m_configuration = configuration;
            m_endpoint = endpoint;
            
            // update the default subscription. 
            m_defaultSubscription.MinLifetimeInterval = (uint)configuration.ClientConfiguration.MinSubscriptionLifetime;

            if (m_endpoint.Description.SecurityPolicyUri != SecurityPolicies.None)
            {
                // update client certificate.
                m_instanceCertificate = clientCertificate;

                if (clientCertificate == null)
                {
                    // load the application instance certificate.
                    if (m_configuration.SecurityConfiguration.ApplicationCertificate == null)
                    {
                        throw new ServiceResultException(
                            StatusCodes.BadConfigurationError,
                            "The client configuration does not specify an application instance certificate.");
                    }

                    m_instanceCertificate = m_configuration.SecurityConfiguration.ApplicationCertificate.Find(true);
                }

                // check for valid certificate.
                if (m_instanceCertificate == null)
                {
                    throw ServiceResultException.Create(
                        StatusCodes.BadConfigurationError,
                        "Cannot find the application instance certificate. Store={0}, SubjectName={1}, Thumbprint={2}.",
                        m_configuration.SecurityConfiguration.ApplicationCertificate.StorePath,
                        m_configuration.SecurityConfiguration.ApplicationCertificate.SubjectName,
                        m_configuration.SecurityConfiguration.ApplicationCertificate.Thumbprint);
                }

                // check for private key.
                if (!m_instanceCertificate.HasPrivateKey)
                {
                    throw ServiceResultException.Create(
                        StatusCodes.BadConfigurationError,
                        "Do not have a privat key for the application instance certificate. Subject={0}, Thumbprint={1}.",
                        m_instanceCertificate.Subject,
                        m_instanceCertificate.Thumbprint);
                }

                //load certificate chain
                /*m_instanceCertificateChain = new X509Certificate2Collection(m_instanceCertificate);
                List<CertificateIdentifier> issuers = new List<CertificateIdentifier>();
                configuration.CertificateValidator.GetIssuers(m_instanceCertificate, issuers);
                for (int i = 0; i < issuers.Count; i++)
                {
                    m_instanceCertificateChain.Add(issuers[i].Certificate);
                }*/
            }

            // initialize the message context.
            ServiceMessageContext messageContext = channel.MessageContext;

            if (messageContext != null)
            {
                m_namespaceUris = messageContext.NamespaceUris;
                m_serverUris    = messageContext.ServerUris;
                m_factory       = messageContext.Factory;
            }    
            else
            {
                m_namespaceUris = new NamespaceTable();
                m_serverUris    = new StringTable();
                m_factory       = ServiceMessageContext.GlobalContext.Factory;
            }

            // set the default preferred locales.
            m_preferredLocales = new string[] { CultureInfo.CurrentCulture.Name };

            // create a context to use.
            m_systemContext = new SystemContext();

            m_systemContext.SystemHandle = this;
            m_systemContext.EncodeableFactory = m_factory;
            m_systemContext.NamespaceUris = m_namespaceUris;
            m_systemContext.ServerUris = m_serverUris;
            m_systemContext.TypeTable = this.TypeTree;
            m_systemContext.PreferredLocales = null;
            m_systemContext.SessionId = null;
            m_systemContext.UserIdentity = null;
        }