InfoBoxData data; data.SetInvalid();
InfoBoxData data(10); if(data.IsValid()) { // perform some operation with valid data } else { data.SetInvalid(); }In this example, an InfoBoxData object named `data` is created with an initial value of 10. The `IsValid` method is used to check whether the value is valid or not. If the value is valid, some operation can be performed, but if it is invalid, the `SetInvalid` method is used to mark the value as invalid. The package library that includes InfoBoxData class and its methods is not clear from the given information.