private void LoadFile()
 {
     try
     {
         xlFileReader = new XlFileReader();
         xlFileReader.LoadFile("MetrologicGroups.xlsx");
         fileWasLoaded = true;
     }
     catch (Exception ex)
     {
         throw new MetrologicGroupFileNotFoundException(ex.Message);
     }
 }
 private void ReadDatalFile(string path)
 {
     if (!File.Exists(path))
     {
         throw new FileSearshException();
     }
     try
     {
         reader.LoadFile(path);
     }
     catch
     {
         throw new FileSearshException();
     }
 }