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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. A. Bell has 20+ years of Software and Electrical Engineering experience: Win/Web veteran, published 300+ articles and authored 37 inventions, credited for 10+ Enterprise level projects (>250k code lines); currently focused on .NET/WPF/C#, Javascript/jQuery, 'Big Data', AI, IoT and Mobile apps. Participated in App Innovation Contest (AIC 2102/2013) with several winning submissions. Sample projects/pubs follow:
  1. WebTV Project: Embedded YouTube Player (Goog #1 YouTube API for ASP.NET)
  2. Edumatter M12: School Math Calculators and Equation Solvers (contest winner)
  3. Engineering Calculator VOLTA-2013 (contest winner)
  4. Online 3 Fractions Calculator (#1 on Goog)
  5. Engineering Calculator VOLTA-814 for Windows
  6. Real-time NY Bus monitoring app
  7. Inflation Calculator
  8. PaydayNY-2015 Payroll Tax Calculator (Win)
  9. Multilingual Geocoder with Interactive Map
  10. Semantic Analyzer (Concordance Calculator)
  11. Prime Factoring Calculator

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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 
FYI, the algorithm was posted by Robert Rohde. Deeksha just edited it. Also, I recommend you use the full link rather than a shortened one (the shortened one looks suspicious, as it could redirect to anywhere without me knowing until I click it).

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