Opc.Ua.Configuration.MainForm.ReplaceTrustListBTN_Click C# (CSharp) Method

        private void ReplaceTrustListBTN_Click(object sender, EventArgs e)
        {
            try
            {
                // get application.
                ManagedApplication application = ApplicationToManageCTRL.GetSelectedApplication();;

                if (application == null)
                {
                    return;
                }

                // load the configuration.
                application.Reload();

                CertificateStoreIdentifier store = GetDefaultStore(application, false);

                // chose trust list to import.
                CertificateStoreDlg dialog = new CertificateStoreDlg();
                dialog.Text = "Select Certificate Trust List to use as Source";
                CertificateStoreIdentifier id = dialog.ShowDialog(store);

                if (id == null)
                {
                    return;
                }

                if (String.Compare(application.TrustList.StorePath, id.StorePath, StringComparison.OrdinalIgnoreCase) == 0)
                {
                    MessageBox.Show("Selected Certificate Store is already the same as the Application Trust List", "Replace Trust List", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    return;
                }

                // check for private keys.
                ICertificateStore targetStore = application.TrustList.OpenStore();
                X509Certificate2Collection certificates = targetStore.Enumerate();

                bool hasPrivateKeys = true;
                StringBuilder buffer = null;
                DialogResult result = DialogResult.None;

                while (hasPrivateKeys)
                {
                    hasPrivateKeys = false;

                    foreach (X509Certificate2 certificate in certificates)
                    {
                        if (certificate.HasPrivateKey)
                        {
                            hasPrivateKeys = true;

                            buffer = new StringBuilder();

                            buffer.Append("The application's current trust list contains certificates with private keys.\r\n");
                            buffer.Append("Automatically deleting these certificates could break other applications. ");
                            buffer.Append("\r\n");
                            buffer.Append("\r\n");
                            buffer.Append("Would you like to remove these certificates manually?\r\n");
                            buffer.Append("\r\n");
                            buffer.Append("Current Application Trust List = ");
                            buffer.Append(application.TrustList.ToString());
                            buffer.Append("\r\n");
                            buffer.Append("Certificate with Private Key = ");
                            buffer.Append(certificate.Subject);

                            result = new YesNoDlg().ShowDialog(buffer.ToString(), "Warning Private Keys Found");

                            if (result != DialogResult.Yes)
                            {
                                return;
                            }

                            new CertificateListDlg().ShowDialog(application.TrustList, false);
                            certificates = targetStore.Enumerate();
                            break;
                        }
                    }
                }

                buffer = new StringBuilder();

                buffer.Append("This operation will delete all of the certificates in the current application trust list and ");
                buffer.Append("replace them with the certificates in the selected trust list.");
                buffer.Append("\r\n");
                buffer.Append("\r\n");
                buffer.Append("Do you wish to proceed?\r\n");
                buffer.Append("\r\n");
                buffer.Append("Current Application Trust List = ");
                buffer.Append(application.TrustList.ToString());
                buffer.Append("\r\n");
                buffer.Append("Selected Trust List = ");
                buffer.Append(id.ToString());
               
                result = new YesNoDlg().ShowDialog(buffer.ToString(), "Replace Trust List");

                if (result != DialogResult.Yes)
                {
                    return;
                }

                // delete existing certificates.
                certificates = targetStore.Enumerate();

                foreach (X509Certificate2 certificate in certificates)
                {
                    if (!certificate.HasPrivateKey)
                    {
                        targetStore.Delete(certificate.Thumbprint);
                    }
                }

                // copy the certificates.
                ICertificateStore sourceStore = id.OpenStore();

                foreach (X509Certificate2 certificate in sourceStore.Enumerate())
                {
                    targetStore.Add(new X509Certificate2(certificate.RawData));
                }

                EditTrustListBTN_Click(sender, e);
            }
            catch (Exception exception)
            {
                GuiUtils.HandleException(this.Text, MethodBase.GetCurrentMethod(), exception);
            }
        }