true if any persistent part of this object has changed; otherwise false. When FormSetFile writes the properties of a FormSet object to a form set file, or when it reads those properties from a form set file, it will reset this property to false.
The persistent parts of this object are the FormDefinitions, Identification, Operations, and OtherDataItems properties. When you change any of them, this property will automatically change to true.
You can also set the value of this property. If you set it to false, it will also set the HasChanged property of the FormDefinitions, Identification, Operations, and OtherDataItems properties.
If you create a new derived class from this class to manage I/O to a format different from that supported by FormSetFile, you must set this value to false after reading or writing its contents.
Default value: false