public BendSheetData(string sourceFile, string targetFile, BendSheetDataType fileType)
        {
            _sourceFileName = sourceFile;
            _fileType = fileType;

            using (_engine = new ExcelEngine(sourceFile))
            {
                LoadSourceFile();
                _engine.CloseExcelWorkbook();
            }

            _engine = new ExcelEngine(targetFile);
            WriteTargetFile();
            Caption();
        }