How to Toggle String Case in .NET

Using the .NET profiler, I compared

• ToggleCaseByRobert
• ToggleCaseByJohn
• and my new one given below:

        static string ToggleCaseByCeChode(string s)
        {
            char[] chars = s.ToCharArray();
            for (int i = 0; i < chars.Length; i++)
            {
                if(chars[i]<65){}
                else if (chars[i] >122) { }
                else if (chars[i] > 90 && chars[i]<97) { }
                else if ((chars[i] & 32) == 32)
                    chars[i] = (char)(chars[i] - 32);
                else
                    chars[i] = (char)(chars[i] | 32);
            }
            return new String(chars);
        }

and I'm happy to say that ToggleCaseByCeChode wins by a landslide. :) Given a 500 character length string and executing each routing 10k times:

Elapsed Exlusive Time ( Time spent in this function )       
ToggleCaseByJohn     797.60
ToggleCaseByRobert 715.80
ToggleCaseByCeChode 13.05

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Note by Alexander Bell: This algorithm (ToggleCaseByCeChode) indeed provides significant, 5...6 times (!) performance boost against two others, and by far, is the absolute champion in this league of Toggle Case Algorithms!:thumbsup: Kudos to CeChode! Also, online Algorithms efficiency comparison is available at: Toggle Case Algorithms[^]