Collection extension methods

ListUtils.cs

using System.Collections.Generic;
using System;

namespace TarasOsirisGists
{
    public static class ListUtils
    {
        private static Random _rnd;

        /// <summary>
        /// Gets the random element from specified list.
        /// </summary>
        /// <returns>The random element.</returns>
        /// <param name="list">List to get element from.</param>
        /// <typeparam name="T">The 1st type parameter.</typeparam>
        public static T GetRandomElement<T>(this IList<T> list)
        {
            if (_rnd == null)
            {
                _rnd = new Random();
            }
            return list[_rnd.Next(list.Count)];
        }

        public static bool IsEmpty<T>(this IList<T> list)
        {  
            return list.Count == 0;
        }

        public static bool IsLast<T>(this IList<T> list, T element)
        {  
            return list.IndexOf(element) == list.Count - 1;
        }

        public static bool IsFirst<T>(this IList<T> list, T element)
        {  
            return list.IndexOf(element) == 0;
        }

        public static void Shuffle<T>(this IList<T> list)
        {  
            var rng = new Random();  
            int n = list.Count;  
            while (n > 1)
            {  
                n--;  
                int k = rng.Next(n + 1);  
                T value = list[k];  
                list[k] = list[n];  
                list[n] = value;  
            }  
        }
    }
}