private void LoadFile()
 {
     try
     {
         xlFileReader = new XlFileReader();
         xlFileReader.LoadFile("MetrologicGroups.xlsx");
         fileWasLoaded = true;
     }
     catch (Exception ex)
     {
         throw new MetrologicGroupFileNotFoundException(ex.Message);
     }
 }
 public ExternalDataFile(string localPath, string remotePath)
 {
     this.localPath  = localPath;
     this.remotePath = remotePath;
     reader          = new XlFileReader();
 }