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Posted 10 Feb 2011

How to Toggle String Case in .NET

, 14 Feb 2011
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Test Page for both Algorithms:[^]Algorithm by Robert R.: protected string ToggleCaseByRobert(string s) { var sb = new StringBuilder(s.Length); foreach (char c in s) ...
Test Page for both Algorithms:[^]

Algorithm by Robert R.:

protected string ToggleCaseByRobert(string s)
    var sb = new StringBuilder(s.Length);
    foreach (char c in s)
        sb.Append(char.IsUpper(c) ? char.ToLower(c) : char.ToUpper(c));
    return sb.ToString();

Algorithm by John S.:
protected string ToggleCaseByJohn(string s)
    StringBuilder mystring = new StringBuilder(s);
    for (int i = 0; i < mystring.Length; i++) {
        char c = mystring[i];
        mystring[i] = Char.IsLower(c) ? Char.ToUpper(c) : Char.ToLower(c);
    return mystring.ToString();


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Founder Infosoft International Inc
United States United States
Dr. Alexander Bell is a seasoned full-stack Software Engineer (Win/Web/Mobile). He holds PhD in EE/IT, authored 37 inventions and published 300+ technical articles. Currently focused on Java/Javascript, .NET/C#, Android/Mobile, SQL, 'Big Data', Machine Learning, AI, IoT. Alex participated in App Innovation Contests (AIC 2102/2013) with multiple winning submissions. Portfolio samples:

  1. Real-time NY Bus Tracking Web App (IoT)
  2. Android Fraction Calculator "Fractal MK-12"
  3. Android Prime Factorization Calculator 18-digit)
  4. Semaphon™ semantic phone num-to-text converter
  5. Educational Web Portal
  6. Free Online NY Payroll Tax Calculator
  7. WebTV powered by YouTube Player powered by .NET API (#1 on Google)
  8. Engineering Calculator VOLTA
  9. Big Data: Facebook and YouTube
  10. NY City Trivia Quiz
  11. Publications by A. Bell

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Comments and Discussions

GeneralI have to question your testing methodology and conclusion a... Pin
Rod Kemp14-Feb-11 2:17
memberRod Kemp14-Feb-11 2:17 
GeneralThanks for your note; I have already noticed and corrected t... Pin
DrABELL10-Feb-11 9:52
memberDrABELL10-Feb-11 9:52 
GeneralFYI, the algorithm was posted by Robert Rohde. Deeksha just ... Pin
AspDotNetDev10-Feb-11 8:57
protectorAspDotNetDev10-Feb-11 8:57 

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