public void InstallFont(string fontFilePath) { var callback = OperationContext.Current.GetCallbackChannel <IFontInstallerCallbackService>(); try { FontRegistry.RegisterFont(fontFilePath); callback.FontInstalledCallback(true, ""); _log.WriteEntry("Font installed: " + fontFilePath, EventLogEntryType.Information); } catch (Exception e) { callback.FontInstalledCallback(false, e.Message); } }