Make a string title or proper case

String to title case

    public static class StringHelper
    {
        public static string ToTitleCase(this string s)
        {
            // Return empty if input is null or empty
            if (string.IsNullOrEmpty(s)) return string.Empty;

            // This will hold our processing value
            // and finally have string in title case.
            var sb = new StringBuilder();

            // Do we need to make next character upper case
            // First chracter should be upper case so
            // default value is 'true' for this flag
            bool nextUpper = true;

            // Enumerate through each letter in the string/text
            for (int idx = 0; idx < s.Length; idx++)
            {

                // Get the current letter
                string curLetter = s[idx].ToString();

                // If flag is true make upper otherwise lower
                if (nextUpper)
                    sb.Append(curLetter.ToUpper());
                else
                    sb.Append(curLetter.ToLower());

                // If current letter was a blank space
                // we need to make next letter upper case
                nextUpper = (curLetter == " ");

            }

            // Finally return the new title case string/text
            return sb.ToString();
        }
    }