| CallbackId | System.String | Gets or sets the identifier of the callback method to invoke on the client. |
| ClientId | System.String | Gets or sets the client id that was sent with the original request. |
| IsError | System.Boolean | Gets or sets a value indicating that an error occurred. |
| RouteIndex | System.Nullable`1 | Gets or sets the client route index. If the route index is set, the routeData on the client is updated only when the active client route index matches with the data response. |
| RoutePath | System.String | Gets the client route path. If the route path is set, the viewData on the client is updated only when the active client route path matches with the data response. |