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Posted 10 Feb 2011

How to Toggle String Case in .NET

, 14 Feb 2011 CPOL
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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

President 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 HTML5/CSS3, Javascript, .NET/WPF/C#, Angular.js, 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. Integrated Sensors Hub (IMU) Testing Web Page

  3. Semaphon™ semantic phone num-to-text converter

  4. Educational Web Portal

  5. Free Online NY Payroll Tax Calculator

  6. WebTV powered by YouTube Player powered by .NET API (#1 on Google)

  7. Top-50 Digital Cameras (by iMark-DCAM rating engine)

  8. Pure CSS3 Slide Show

  9. Inflation Calculator

  10. Multilingual Geocoder with Interactive Map

  11. Online Semantic Analyzer (Concordance Calculator)

  12. Advanced CSS3 Table Formatting

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Comments and Discussions

GeneralI have to question your testing methodology and conclusion a... Pin
Rod Kemp14-Feb-11 1:17
memberRod Kemp14-Feb-11 1:17 
GeneralThanks for your note; I have already noticed and corrected t... Pin
DrABELL10-Feb-11 8:52
memberDrABELL10-Feb-11 8:52 
GeneralFYI, the algorithm was posted by Robert Rohde. Deeksha just ... Pin
AspDotNetDev10-Feb-11 7:57
protectorAspDotNetDev10-Feb-11 7:57 

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