public void Run() { // this examples shows a special method to ask at runtime for a particular method oder property // morevover you can enable the option NetOffice.Settings.EnableSafeMode. // NetOffice checks(cache supported) for any method or property you call and // throws a EntitiyNotSupportedException if missing // create new instance Excel.Application application = new Excel.Application(); // any reference type in NetOffice implements the EntityIsAvailable method. // you check here your property or method is available. // we check the support for 2 properties at runtime bool enableLivePreviewSupport = application.EntityIsAvailable("EnableLivePreview"); bool openDatabaseSupport = application.Workbooks.EntityIsAvailable("OpenDatabase"); string result = "Excel Runtime Check: " + Environment.NewLine; result += "Support EnableLivePreview: " + enableLivePreviewSupport.ToString() + Environment.NewLine; result += "Support OpenDatabase: " + openDatabaseSupport.ToString() + Environment.NewLine; // quit and dispose application.Quit(); application.Dispose(); HostApplication.ShowMessage(result); }