C# String permutation

Question

I have 5 strings, such as: \"one\", \"two\", \"three\", \"four\", and \"five\". I need to get all permutations of these strings. I\'ve explored all internet resources, but a

Answer 1

Permutations are very easy to do.

/// 

/// Returns all permutations of the input .
/// 
/// The list of items to permute.
/// A collection containing all permutations of the input .
public static IEnumerable> Permutations(this IEnumerable source)
{
    if (source == null)
        throw new ArgumentNullException("source");
    // Ensure that the source IEnumerable is evaluated only once
    return permutations(source.ToArray());
}

private static IEnumerable> permutations(IEnumerable source)
{
    var c = source.Count();
    if (c == 1)
        yield return source;
    else
        for (int i = 0; i < c; i++)
            foreach (var p in permutations(source.Take(i).Concat(source.Skip(i + 1))))
                yield return source.Skip(i).Take(1).Concat(p);
}