Upper Case the First Letter of a String

This is a simple string extension for upper casing the first letter of a string, the code originally came from here.

    public static class StringExtensions
        public static string FirstLetterToUpperCase(this string s)
            if (string.IsNullOrEmpty(s))
                throw new ArgumentException("There is no first letter");

            char[] a = s.ToCharArray();
            a[0] = char.ToUpper(a[0]);
            return new string(a);

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