Random element of List<T> from LINQ SQL

I'm using C# 3.5 and am currently using Linq to get all users from a user table and put them in a list.

Now I would like to return a random user from that list. What's the best way to go about doing that?

Edit: Found it here: How to get a Random Object using Linq

Solution 1:

Like this:

var rand = new Random();
var user = users[rand.Next(users.Count)];

Solution 2:

Use ElementAt:

var rand = new Random();
var user = users.ElementAt( rand.Next( users.Count() ) );

Solution 3:

Why not create a generic helper and/or extension?!

namespace My.Core.Extensions
{
    public static class EnumerableHelper<E>
    {
        private static Random r;

        static EnumerableHelper()
        {
            r = new Random();
        }

        public static T Random<T>(IEnumerable<T> input)
        {
            return input.ElementAt(r.Next(input.Count()));
        }

    }

    public static class EnumerableExtensions
    {
        public static T Random<T>(this IEnumerable<T> input)
        {
            return EnumerableHelper<T>.Random(input);
        }
    }
}

Usage would be:

        var list = new List<int>() { 1, 2, 3, 4, 5 };

        var output = list.Random();