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Shuffle the characters in a string but excluding the original string that was passed in. The method checks that we have passed in a string of more than two characters as if we have less than two characters it is not possible to return anything but the original string.
public static string ShuffleStringExcludeOriginal(string stringToShuffle)
{
    string shuffled;
 
    if (String.IsNullOrEmpty(stringToShuffle))
    {
        throw new ArgumentNullException("stringToShuffle",
                                        "The stringToShuffle variable must not be null or empty");
    }
 
    if (stringToShuffle.Length < 2)
    {
        throw new ArgumentException("This method can not be used when the string to shuffle is less than two " +
                                    "characters long as it is not possible to exclude the original",
                                    "stringToShuffle");
    }
 
    do
    {
        shuffled = new string(
                                stringToShuffle
                                    .OrderBy(character => Guid.NewGuid())
                                    .ToArray()
                                );
    } while (shuffled == stringToShuffle);
 
    return shuffled;
}
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