using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Linq;
using System.Text;

public static class MyExtensions
{
    public static IEnumerable<T> SkipLast<T>(this IEnumerable<T> source,
        int count)
    {
        Queue<T> saveList = new Queue<T>();
        int saved = 0;
        foreach (T item in source)
        {
            if (saved < count)
            {
                saveList.Enqueue(item);
                ++saved;
                continue;
            }
            saveList.Enqueue(item);
            yield return saveList.Dequeue();
        }
        yield break;
    }
}

class Program
{
    static void Main(string[] args)
    {
        int[] a = new[] { 1, 2, 3, 4, 5 };
        var b = a.SkipLast(2);
        foreach (var item in b)
            Console.WriteLine(item);

        List<string> c = new List<string>() {
            "one", "two", "three", "four", "five"
        };
        var d = c.Skip(1).SkipLast(1);
        foreach (var e in d)
            Console.WriteLine(e);
    }
}