Strings in C#

Strings in C#: Understanding the String Class, String Interpolation, Useful String Methods, Common String Tasks.

Updated November 3, 2026

1. Understanding the String Class (Novice): A C# string is a read-only sequence of characters; read them by index, write special characters with escape sequences, and understand why strings never change.
2. String Interpolation (Novice): Build strings by putting values straight into the text with quot;...{value}...", and format numbers, money and columns as you go.
3. Useful String Methods (Apprentice): Find text with IndexOf, LastIndexOf, Contains, StartsWith and EndsWith, and cut and reshape it with Substring, Split, ToUpper, ToLower, Trim and Replace.
4. Common String Tasks (Apprentice): Combine string methods to do everyday jobs, cleaning up input, reformatting names and phone numbers, padding, reversing and building long strings.