using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var item1 = new ListItem {Name = "Item 1"};

        var item2 = new ListItem {Name = "Item 2", Next = item1};

        var item3 = new ListItem {Name = "Item 3", Next = item2};

        var item4 = new ListItem {Name = "Item 4", Next = item3};

        var item5 = new ListItem {Name = "Item 5", Next = item4};

        PrintList(item5);

        Console.WriteLine();

        var newStart = RevertList2(item5);      

        PrintList(newStart);

    }

    private static void PrintList(ListItem item) 

    {

        Console.WriteLine(item.Name);

        if (item.Next != null)

            PrintList(item.Next);

    }

    private static ListItem RevertList(ListItem item, ListItem previous = null) {

        var nextItem = item.Next;

        if (nextItem != null)

        {

            var nextItemsNext = nextItem.Next;

            nextItem.Next = item;

            item.Next = previous;

            if (nextItemsNext != null)

                return RevertList(nextItemsNext, nextItem);

            else

                return nextItem;

        }

        else 

        {

            item.Next = previous;

            return item;

        }

    }

    private static ListItem RevertList2(ListItem item) 

    {

        var stack = new Stack<ListItem>();

        stack.Push(item);

        var currentItem = item;

        while (currentItem.Next != null)

        {

            stack.Push(currentItem.Next);

            currentItem = currentItem.Next;

        }

        var firstItem = stack.Peek();

        while (stack.Count > 1) {

            currentItem = stack.Pop();

            currentItem.Next = stack.Peek();

        }

        stack.Pop().Next = null;

        return firstItem;

    }

}

​

class ListItem

{

    public string Name {get;set;}

    public ListItem Next {get;set;}

}