public class AnkietaService
    {
        public static List<string> ReadFile()
        {
            String path = HostingEnvironment.MapPath(@"\App_Data\Ankieta.csv");
            IEnumerable<string> strCSV =
                File.ReadLines(path);
            var results = from str in strCSV
                          let tmp = str.Split(';')
                          .Skip(1)
                          .Select(x => Convert.ToInt32(x))
                          select new
                          {
                              Max = tmp.Max(),
                              Min = tmp.Min(),
                              Total = tmp.Sum(),
                              Avg = tmp.Average()
                          };

            // caching for performance
            var query = results.ToList();
            List<string> lista = new List<string>();
            foreach (var x in query)
            {
                lista.Add(
                    string.Format("Maximum: {0}, " +
                                  "Minimum: {1}, " +
                                  "Total: {2}, " +
                                  "Average: {3}",
                                  x.Max, x.Min, x.Total, x.Avg));
            }
            return lista;
        }
    }