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Important: to avoid performance degradation, you should dispose PersistentRange when it is no longer needed.
System.Object
GrapeCity.Documents.Word.ContentCollection<T>
GrapeCity.Documents.Word.ContentObjectCollection<T>
GrapeCity.Documents.Word.RangeBase
GrapeCity.Documents.Word.Range
GrapeCity.Documents.Word.PersistentRange