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Reverse a String C# - Efficient Way

This is arguably the most efficient way to reverse a string - C#
Func ReverseString = delegate(string s)
                char[] word = s.ToCharArray();
                for (int i = 0, j = (s.Length - 1); i < j; i++, j--)
                    char _temp = word[i];
                    word[i] = s[j];
                    word[j] = _temp;

                return new string(word);

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