TypingMonkey to generate random strings

gistfile1.cs

    /// <summary>
    /// The Typing monkey generates random strings - can't be static 'cause it's a monkey.
    /// </summary>
    /// <remarks>
    /// If you wait long enough it will eventually produce Shakespeare.
    /// </remarks>
    class TypingMonkey
    {
        private const string legalCharacters = " abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890.";

        static Random random = new Random();

        /// <summary>
        /// The Typing Monkey Generates a random string with the given length.
        /// </summary>
        /// <param name="size">Size of the string</param>
        /// <returns>Random string</returns>
        public string TypeAway(int size)
        {
            StringBuilder builder = new StringBuilder();
            char ch;

            for (int i = 0; i < size; i++)
            {
                ch = legalCharacters[random.Next(0, legalCharacters.Length)];
                builder.Append(ch);
            }

            return builder.ToString();
        }
    }