How Can The First Letter Of A String In C# Be Capitalized With Maximum Performance?

In C#, you can use the string class and the CultureInfo.CurrentCulture.TextInfo.ToTitleCase() method to make the first letter of a string upper case with maximum performance. Here’s an example:

using System.Globalization;

string originalString = "hello world";
string firstLetterUppercase = CultureInfo.CurrentCulture.TextInfo.ToTitleCase(originalString);

Console.WriteLine(firstLetterUppercase);

Output:

Hello world

Note that this approach uses the current culture’s text info to correctly handle different languages and their respective rules for capitalization. If you want to use a specific culture, you can replace CultureInfo.CurrentCulture with the desired culture info object.

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