using System;
using System.Collections.Generic;
using System.Linq;
 
public class Test
{
	public static void Main()
	{
        var list = Enumerable.Range(0, 10).ToList();
        Console.WriteLine("- move 5 to 1 -");
        list.MoveItem(5, 1);
        list.ForEach(n => Console.WriteLine(n));
 
        Console.WriteLine("- move 2 to 9 -");
        list.MoveItem(2, 9);
        list.ForEach(n => Console.WriteLine(n));
	}
}
 
static class Extensions
{
    public static void MoveItem<T>(this List<T> list, int from, int to)
    {
        var target = list[from];
        list.RemoveAt(from);
        list.Insert(to, target);
    }
}
 

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