The Turkish İ Problem and Why You Should Care (2012)

Take a look at the following code. const string input = "interesting" ; bool comparison = input . ToUpper () == "INTERESTING" ; Console . WriteLine ( "These things are equal: " + comparison ); Console . ReadLine (); Let’s imagine that input is actually user input or some value we get from an API. That’s going to print out These things are equal: True right? Right?! Well not if you live in Turkey. Or more accurately, not if the current culture of your operating system is tr-TR (which is likely if you live in Turkey). To prove this to ourselves, let’s force this application to run using the Turkish locale. Here’s the full source code for a console application that does this. using System ; using System.Globalization ; using System.Threading ; internal class Program { private static void Main ( string [] args ) { Thread . CurrentThread . CurrentCulture = new CultureInfo ( "tr-TR" ); const string input = "interesting" ; bool comparison = input . ToUpper () == "INTERESTING" ; Console . ... Read full article.