Hidden control that only hold value.
Retrieves the default value for the control.
This call is only made if there is a field validation set for the field info and the field has any content.
Performs field validation when the user leaves the field or one of its dependencies is changed, initial values set by default value and initial values in edit-mode are not validated.
When saving the validation runs server side if the field value has changed. A field value is considered changed if in new mode the value is anything other than
NULL. In edit mode it is considered changed if it has a value that was not returned by the GetEditFields procedure.