Exception Handling

🔷 C# Programming Lesson 14 Advanced

Exceptions are runtime disruptions caused by errors. C# uses try-catch-finally blocks to handle errors gracefully, preventing application crashes.

1 Try-Catch-Finally Flow Control

Exception handling flows systematically:

try: Wraps code blocks that may throw exceptions.
catch: Intercepts and handles errors if they occur.
finally: Executes cleanup code after try/catch, regardless of whether an error was thrown.

2 Exception Code

Let's run a program handling a division-by-zero error using try-catch blocks:

C# — Exceptions ▶ Run Code

using System;

class Program {
    static void Main() {
        try {
            int x = 10;
            int y = 0;
            int result = x / y; // Throws DivideByZeroException
        } catch (DivideByZeroException e) {
            Console.WriteLine("Exception Caught: Division by zero is invalid.");
        } finally {
            Console.WriteLine("Finally block executed. Resources released.");
        }

        Console.WriteLine("Program continues execution smoothly...");
    }
}

3 Code Challenge

Challenge: Write a method called `CheckAge(int age)` that throws an `ArgumentOutOfRangeException` if age is negative. Test it inside a try-catch block in `Main()` and print the caught error message.