using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

    List<int> list = new List<int>(new int[] { 0,1,2,3,4,5,6,7,8,9 });

    var selected  = new List<int>(new int[] { 0,1,2 });

​

    list = list.Except(selected).ToList();

    list.AddRange(selected);

​

    Console.WriteLine(string.Join(",", list));

    }

}