using System;

using System.Linq;                  

public class Program

{

    public static void Main()

    {

        int index = 3;

        string[] list = new string[] {"zero","one","two","three","four","five","six"};

         var result = list.Select((item ,i) => new { item , neworder = i == index ? 0 : 1})

           .OrderBy(x=> x.neworder).Select(a=> a.item);

        foreach(string x in result)

            Console.WriteLine(x);

    }

}