class Program

    {

        static void Main(string[] args)

        {

            DataTable dt = new DataTable();

            dt.Columns.Add("Name", typeof(System.String));

            dt.Columns.Add("Value", typeof(System.Int32));

            dt.Rows.Add("", );

            dt.Rows.Add("", );

            dt.Rows.Add("", );

            dt.Rows.Add("", );

            dt.Rows.Add("", );

            dt.Rows.Add("", );

            dt.Rows.Add("", );

            dt.Rows.Add("", );

            dt.Rows.Add("", );

            dt.Rows.Add("", );

            var query = from t in dt.AsEnumerable()

                        group t by new { Name = t.Field<string>("Name") } into m

                        select new

                        {

                            Name = m.Key.Name,

                            Sum = m.Sum(n => n.Field<int>("Value")),

                            CustomerValue = m.Aggregate(, (d, n) =>

                            {

                                return d | n.Field<int>("Value");

                            })

                        };

            query.ToList().ForEach(p =>

            {

                Console.WriteLine($"Name:{p.Name}\tSum:{p.Sum}\tCustomerValue:{p.CustomerValue}");

            });

            Console.ReadKey();

        }

    }