Extension methods for sampling items in generic collections.

SampleCollectionExtension.cs

using System;
using System.Collections.Generic;
using System.Linq;

namespace System.Collections.Generic
{
    public static class SampleCollectionExtension
    {
        private static readonly Random Random = new Random();

        public static TItemType Sample<TItemType>(this ICollection<TItemType> collection)
        {
            var index = Random.Next(0, collection.Count - 1);
            return collection.ElementAt(index);
        }

        public static TItemType Sample<TItemType>(this TItemType[] collection)
        {
            var index = Random.Next(0, collection.Length - 1);
            return collection[index];
        }
    }
}