using System;

using System.Xml;

using System.Xml.Serialization;

using System.IO;

using System.Linq;

using System.Collections;

using System.Collections.Generic;

using System.Xml.Linq;

using System.Data;

​

public class Program

{

    public static void Main()

    {

        // Multidimensional approach

        int[,]  numbers = new int[3,5]

        {

            {1, 4,5,6, 10}, 

            {1,-2,3, 10, 1, }, 

            {-7,-8,-9, -1, 0}

        };

        var row_sum  = numbers.Cast<int>()      

        .Select((x, i) => new { Index = i, Value = x })

        .GroupBy(x => x.Index / (numbers.GetUpperBound(1) +1))

        .Select(x => x.OrderBy(c=>c.Value).Skip(1).Take(numbers.GetUpperBound(1)-1).Sum(c=>c.Value))

        .ToArray(); 

        row_sum.Dump();

        // Array or Arrays

        int[][]  numbers2 = new int[][]

        {

            new int[] {1, 4,5,6, 10}, 

            new int[] {1,-2,3, 10, 1, }, 

            new int[] {-7,-8,-9, -1, 0}

        };

        var sum_array =numbers2.Select(x => x.OrderBy(c=>c)

                                             .Skip(1)

                                             .Take(x.Length-2)

                                             .Sum(c=>c)

                                      );

        sum_array.Dump();

        /*

        foreach(var q in query)

        {

            Console.WriteLine(q);

        }*/

    }

}

​

​

​

​