public ExcelCollectionDisplayer()
 {
     Printer          = new ConsolePrinter();
     excelWriter      = new ExcelWriter();
     FirstCollection  = new HashSet <string>();
     SecondCollection = new HashSet <string>();
     try
     {
         InputFilePath      = ConfigurationSettings.AppSettings["excelInputFilePath"];
         OutputFilePath     = ConfigurationSettings.AppSettings["excelOutputFilePath"];
         FirstColumnNumber  = Convert.ToInt32(ConfigurationSettings.AppSettings["firstColumnNumber"]);
         SecondColumnNumber = Convert.ToInt32(ConfigurationSettings.AppSettings["secondColumnNumber"]);
     }
     catch (Exception e)
     {
         throw e;
     }
 }
        public DirectoryCollectionDisplayer()
        {
            Printer              = new ConsolePrinter();
            excelWriter          = new ExcelWriter();
            FirstUniqueFileList  = new HashSet <string>();
            SecondUniqueFileList = new HashSet <string>();
            FirstFileList        = new List <string>();
            SecondFileList       = new List <string>();
            try
            {
                OutputFilePath      = ConfigurationSettings.AppSettings["excelOutputFilePath"];
                FirstDirectoryPath  = ConfigurationSettings.AppSettings["firstDirectoryAddress"];
                SecondDirectoryPath = ConfigurationSettings.AppSettings["secondDirectoryAddress"];
            }

            catch (Exception e)
            {
                throw e;
            }
        }