Adding Random Functionality to Generic Lists using Extension Methods

namespace DevWilson
{
    using System;
    using System.Collections.Generic;

    /// <summary>
    /// Adds extension methods for System.Collections.Generic.IList&lt;T&gt;.
    /// </summary>
    public static class IListRandomExtensions
    {
        private static Random random = new Random();

        /// <summary>
        /// Randomly shuffles the elements within the list.
        /// </summary>
        /// <typeparam name="T">The type of elements in the list.</typeparam>
        /// <param name="list">Represents a collection of objects that can be individually accessed by index.</param>
        public static void Shuffle<T>(this IList<T> list)
        {
            if (list.Count <= 1)
            {
                return; // nothing to do
            }

            // don't shuffle the last element with itself
            for (int i = 0; i < list.Count - 1; i++)
            {
                T x = list[i];

                int index = random.Next(i + 1, list.Count);
                list[i] = list[index];
                list[index] = x;
            }
        }

        /// <summary>
        /// Returns a single element from the list, selected at random.
        /// </summary>
        /// <typeparam name="T">The type of elements in the list.</typeparam>
        /// <param name="list">Represents a collection of objects that can be individually accessed by index.</param>
        /// <returns>An element from the list or the default value if no elements exist.</returns>
        public static T GetRandom<T>(this IList<T> list)
        {
            if (list.Count == 0)
            {
                return default(T);
            }

            return list[random.Next(0, list.Count)];
        }
    }
}