private void ResetStringTypes(IEnumerable <XmlDocument> documents, WorksheetStringType toStringType)
 {
     foreach (var document in documents)
     {
         sheetDocumentSaver.ResetStringTypes(document, toStringType);
     }
 }
        public XmlDocument ResetStringTypes(XmlDocument document, WorksheetStringType toStringType)
        {
            try
            {
                targetDocument = document;
                targetStringType = toStringType;

                ResetStringTypesIn(targetDocument);

                return targetDocument;
            }
            catch (Exception e)
            {
                throw new ExcelSheetException(UpdateErrorMessage + e.Message);
            }
        }