using System;

using System.Collections.Generic;

​

namespace ConsoleApp1

{

    class Program

    {

        static void Main(string[] args)

        {

            Program p = new Program();

            var list = new List<int>() { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };

            var sorted = p.SortMinMax(list);

            foreach (var i in sorted) Console.Write(i + ",");

        }

        private List<int> SortMinMax(List<int> list)

        {

            List<int> sorted = new List<int>();         

            list.Sort();

            var arraylist = list.ToArray();

                int a = 0;

                int b = 9;

            for(int i = 0 ; i < list.Count - 5;i++)

            {

​

                sorted.Add(arraylist[a]);

                sorted.Add(arraylist[b]);

                a++;

                b--;

            }

            return sorted;

        }

    }

}

​