using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        List<short> resultTemp = new List<short> { 1,2,3,4,5,6,7,8,9 };

        var targetItemsCount = 6;

​

        double increment = Convert.ToDouble(resultTemp.Count) / targetItemsCount;

​

        List<short> result = Enumerable.Range(0, targetItemsCount).

                                        Select(x => resultTemp[(int)(x * increment)]).

                                        ToList();

        foreach (short x in result)

        {

            Console.WriteLine(x);

        }

    }

}