How to split string preserving whole words?

Question

I need to split long sentence into parts preserving whole words. Each part should have given maximum number of characters (including space, dots etc.). For example:

Answer 1

Joel there is a little bug in your code that I've corrected here:

public static string[] StringSplitWrap(string sentence, int MaxLength)
{
        List parts = new List();
        string sentence = "Silver badges are awarded for longer term goals. Silver badges are uncommon.";

        string[] pieces = sentence.Split(' ');
        StringBuilder tempString = new StringBuilder("");

        foreach (var piece in pieces)
        {
            if (piece.Length + tempString.Length + 1 > MaxLength)
            {
                parts.Add(tempString.ToString());
                tempString.Clear();
            }
            tempString.Append((tempString.Length == 0 ? "" : " ") + piece);
        }

        if (tempString.Length>0)
            parts.Add(tempString.ToString());

        return parts.ToArray();
}